Category: SDDb Research Notes

Posted on

The Nightmares of Halloween

It’s more than a metaphor to say that Halloween is a time when our nightmares go on parade. The scary images, decorations, and costumes that take over the month of October have a direct psychological connection to the actual themes and patterns of people’s nightmares. If we look at current research on nightmares—who has them, what they’re about, what causes them—we can gain new insight into the unconscious creativity of our Halloween festivities.

Who has nightmares? Numerous studies have reached the same conclusion: children are especially prone to nightmares, and so are women. Let’s start with age. The younger you are, the more likely you experience nightmares. Ernest Hartmann’s 1984 book The Nightmare notes the frequency of nightmares in children between the ages of 3 and 6, and he suggests that bad dreams may begin even earlier than this: “It is quite likely that nightmares can occur as early as dreams can occur; that is, probably late in the first year of life.”

The age factor shows up clearly in the nightmare patterns of adults. In a 2010 survey (available in the Sleep and Dream Database) in which 2,993 American adults answered a series of questions about sleep and dreams, the following are the percentages of people in different age groups who answered “Yes” to the question, “Have you ever had a dream of being chased or attacked?”

Chasing/Attack dreams, by age:

18-24: 71%

25-34: 65%

35-54: 59%

55-69: 48%

70+:  40%

Now for gender. Women tend to have more nightmares than men do, although how much more seems to vary during the life cycle. A meta-analysis by Michael Schredl and Iris Reinhard in 2011 found a striking pattern: similar frequencies of nightmares for males and females in childhood and old age, but a significantly higher frequency of nightmares for females during adolescence and adulthood. There seems to be a “nightmare bump” during women’s lives that elevates their frequency of bad dreams consistently higher than men’s. Is this nature or nurture? Probably both. A similar pattern appears in the 2010 SDDb survey cited above, when analyzed in terms of gender.

Chasing/Attack dreams for men, by age:

18-24: 68%

25-34: 63%

35-54: 56%

55-69: 47%

70+:  37%

Chasing/Attack dreams for women, by age:

18-24: 82%

25-34: 71%

35-54: 65%

55-69: 50%

70+: 46%

No matter how we explain these differences—more on that below—the basic pattern seems clear. Nightmares are especially frequent early in life, and especially for women during adolescence and young adulthood.

What do we have nightmares about? The most common content is fear, of course. And yet, what terrifies one person may have no emotional impact on someone else, so it’s difficult to generalize about the contents of nightmares. Still, it is possible to identify a few typical elements. In the SDDb, I selected four types of dream text (“bad dream,” “nightmare,” “nightmares,” “worst nightmare”), of 25+ words in length, which yielded a set of 423 dreams. I analyzed these 423 dreams using a word-search method with a template of 40 categories of content. I then compared the nightmare results to the results for the SDDb Baselines, a collection of more than 5,000 dreams representing ordinary patterns of dream content.

The dreams in the Baselines average about 100 words per report, while the 423 nightmares have an average length of only 65 words per report. This means the Baselines will tend to have higher frequencies on all categories. That’s actually helpful for our purposes, because it makes it easy to spot the categories that are unusually high in the nightmares (Baselines included in parentheses):

Fire: 4.7% (4.3%)

Air:  6.4% (4.4%)

Falling: 10.9% (8.3%)

Death: 18.4% (8%)

Fantastic beings: 10.4% (2.1%)

Physical aggression: 42.1% (17.6%)

Religion: 7.1% (6.7%)

Weapons: 9.9% (3.9%)

These are the categories of content that seem to be over-represented in nightmares, appearing more often in bad dreams than in ordinary dreams. They are also the themes that characterize pretty much every horror movie ever made, and countless video games, and, of course, many of the costumes and decorations of Halloween.

Why do we have nightmares? Psychologists have offered several theories about this. For Sigmund Freud, a nightmare is a failure of the sleeping mind to contain the instinctual desires aroused in dreaming. Similarly, the neurocognitive theory of Ross Levin and Tore Nielsen explains nightmares as a failure of emotional regulation during sleep. Carl Jung viewed nightmares as reflections of inner conflict, and thus potential revelations of insight and guidance. Antti Revonsuo’s “threat simulation theory” focuses on chasing nightmares and their potentially beneficial role in preparing the individual for similar threats in waking life.

The simple fact that nightmares are so common seems to be evidence against a theory of dreaming as a form of play (such as I propose). How can a frightening experience be playful? Actually, a theory of dreaming as play has a good explanation for the prevalence of nightmares. Research on play in animals and humans has found that play-fighting is one of the most common forms of play among social species like ours. Although it’s not “real” fighting, play-fighting does involve real aggression, threats, and negative emotions, and it seems to have a valuable rehearsal/preparatory function similar to other forms of play. Paradoxically, play-fighting can also promote social bonding by creating a safe arena to work through interpersonal tensions.

This brings us back to the connection between nightmares and Halloween. Seen in this light, the many little rituals of Halloween are ways of playing with our nightmares, welcoming them into waking awareness, sharing them with others, and celebrating their wild creative energies. Once each year, we invite these energies into the community as a way of enlivening and strengthening our collective bonds, at a time when daylight is waning and the nights are growing colder. This is the psychological wisdom of Halloween, infusing us with a playful burst of unconscious vitality just as we’re preparing to survive through the coming darkness.

Note: this post first appeared in Psychology Today on October 21, 2021.

Posted on

Friendly Dreams

Dreams with explicitly sexual and/or violent interactions tend to get the most attention, but dreams actually tend to have surprisingly high proportions of friendly content, too. According to an analysis of the nearly 35,000 dream reports collected in the Sleep and Dream Database, 47% of the women’s dreams have at least one reference to a friendly social interaction (the most used words: friend, friends, boyfriend, help, party, love), as do 36% of men’s dreams (most used words:  friend, friends, girlfriend, help, love, party. For both genders, those figures are greater than the combined percentages for sexual interactions (4% for women, 6% for men) and physically aggressive interactions (15% for women, 22% for men).  If we add in non-physical aggressions (for example, saying or thinking mean things about a person), the relative proportions change, but the key fact remains: Friendly social interactions are a prominent feature of the content of most people’s dreams. If dreams offer a “royal road to a knowledge of the unconscious mind,” as Sigmund Freud famously claimed in The Interpretation of Dreams (2nd ed.), giving evidence of our deepest sexual and aggressive instincts, then dreams also provide evidence of our friendly, prosocial instincts.

Although much less studied than sex and aggression, researchers have identified several patterns in dreams with friendly social interactions. As illustrated above, women tend to have more friendliness in their dreams than do men. Whether this is nature (women are innately more friendly than men) or nurture (women are socialized to be more friendly than men)  is unclear; perhaps aspects of both factors are involved. According to G. William Domhoff in Finding Meaning in Dreams (1996), almost all friendliness in dreams involves the dreamer; there is very little “witnessed” friendliness. Men have more aggression in relation to male characters in their dreams, and more friendliness towards female characters. Women tend to have more friendly interactions in their dreams with men they know, and more aggressive interactions with men they do not know. All of these findings are tendencies, of course, which may or may not apply to specific individuals. But these patterns of friendly content in dreaming do seem consistent with common aspects of people’s social interactions in waking life.

Similar aspects of friendly dreaming occur with several individuals whose long-term dream journals are collected in the SDDb. For example, Jordan, an artist in her forties, has friendly interactions in 43% of her dreams; for Jasmine, a musician in her twenties, it’s 42%; for Mike, a veteran who served in Vietnam as a medic, it’s 40%. My own collection of dreams from 2012 has a friendly interactions figure of 42%; in my dreams from 2020, it’s 44%.

Not everyone has this much friendliness in their dreams. The “Natural Scientist,” whose 1939 journal of 234 dreams was analyzed by J. Allan Hobson in The Dreaming Brain (1987), has friendly interactions in 24% of his dreams. This may reflect the limited social contacts in his waking life (he was a bachelor and a laboratory scientist who studied insects). This seems to reflect the continuity principle of dreaming: the frequency of an element in dreaming reflects the emotional importance of that element in the individual’s waking life. The Natural Scientist may not have dreamed a lot about friendly social interactions, but he did dream about insects more often than anyone else in the SDDb, which was certainly continuous with his waking life.

Some variations in the friendliness of dreaming can be observed over time. During the phase in her twenties when “Beverly” belonged to a secretive religious cult, she had friendliness in 30% of her dreams. After leaving the cult and regaining control of her life, the friendliness in her dreams grew to 34% in her thirties, 36% in her forties, and 40% in her fifties. As she has described in her own writings on the experience, it took a long time for Beverly to liberate herself from the mental shackles of the cult. Her dreams seem to reflect that slow and arduous but ultimately positive journey.

Not surprisingly, nightmares tend to have low frequencies of friendliness. In a survey asking several thousand people to describe their “worst nightmare,” only 8% of the reports of 15 or more words had a reference to friendliness. Similarly, in surveys asking people about their dreams of work, just 8% have a reference to friendliness. By contrast, surveys asking about visitation dreams (in which someone who is dead appears as if alive) have friendliness in 23% of the reports, and surveys asking about “the most memorable dream you’ve ever had in your life” yield references to friendliness in 29% of the reports. It seems the more spiritually-charged a dream becomes, the more likely it will have a friendly social interaction.

Although much more will emerge from future studies, the research so far on friendliness in dreaming has several practical implications.

First, you can learn about the depth and quality of your relationships with your friends by considering who does and doesn’t appear in your dreams, and how you interact with them when they do appear.

Second, you can observe the patterns of who in your dreams initiates a friendly act, versus who receives the friendly act. Are you always on the giving end, or the receiving end? Do some of your friends only appear in one or the other role?

Third, you can see in dreams when feelings of friendliness become mixed with feelings of romantic and sexual desire. In some dreams it’s hard to tell if an interaction is friendly or romantic—which may be exactly the point, in terms of bringing to conscious awareness your ambiguous feelings towards someone else.

Fourth, if you notice that the frequency of friendliness in your dreams diminishes drastically, that might be a sign of difficulties with your social life. Everyone has their own baseline of “normal” friendliness in their dreams, so it’s worth paying enough attention to your dreams over time and becoming familiar with your own regular patterns, to enable you to recognize worrisome changes when they occur.

Note: this post first appeared in Psychology Today, 9/11/21.

Posted on

Aggression in Dreams

Hitting, fighting, chasing, shooting, killing—these are not only common themes in the news each day, they are also recurrent features of our dreams at night. Few studies have focused specifically on aggression in dreaming, even though Sigmund Freud, the founder of psychoanalysis, claimed that “the inclination to aggression is an original, self-subsisting instinctual disposition in man” (Civilization and its Discontents, 1930). A combination of old and new methods of research can shed light on how this primal instinct plays out in our dreams.

Who Has Aggressive Dreams?

The Hall and Van de Castle system (1966) of dream content analysis has codes for three kinds of social interactions: friendly, sexual, and aggressive. Research using the HVDC system has suggested a few basic patterns in the frequency of aggression in dreams:

  • Men have more aggression, especially physical aggression, in their dreams than do women.
  • Women are more likely to be victims than initiators of aggression in dreams.
  • Children have more aggression in dreams than do adults, especially involving attacks by animals.
  • Older people have less aggression in dreams than do younger people.

Hundreds of studies have used the HVDC method over the past several decades, and their findings support the basic idea that aggression is an innate feature of human dreaming.

Why Do We Have Aggressive Dreams?

An additional perspective comes from using word search technologies to identify significant patterns of meaning in dream content. The Sleep and Dream Database (SDDb) has a template with a category for physical aggression, and a large collection of dreams to study for a specific theme like this.

The SDDb Baseline dreams are a good place to start—a set of 5,321 dreams (3,227 females, 2,094 males) that represent a composite portrait of dreaming in general (the reports were given in response to a question about “your most recent dream”). Although limited in many ways, the Baseline dreams offer an empirical basis for making comparisons across different sets of dreams. This can help in identifying trends and patterns that would be difficult to see otherwise.

Applying the word search category for physical aggression to the female Baselines, we find that 15.1% of the dreams include at least one word relating to physical aggression. Applying the same word search category to the male Baselines yields a result of 21.5% of the dreams with at least one reference to physical aggression. (The combined Baselines figure is 17.6%.) So this analysis confirms the finding of the HVDC system that men’s dreams, on average, seem to involve more physical aggression than do women’s dreams. The top ten words used in these dreams were the following: Hit, kill, fight, chasing, killed, shot, fighting, chased, war, shooting.

Turning to the dreams of individuals who have kept track of their dreams for a lengthy period of time, a great deal of variation appears in the frequency of physical aggression. For example, “Tanya,” a young woman, has a relatively high proportion of physical aggression in her dreams (25.4%, in 563 reports), about the same as “Lawrence,” an older man (25.7%, in 206 reports. Another young woman, “Jasmine,” has low physical aggression in her dreams (10.5%, in 800 reports), just like “RB,” an older man (11.8%, in 51 reports).

There is clear evidence that experiences with physical aggression in waking life can increase the frequency of its appearance in dreaming. The best examples are “Mike,” who served as a medic during the Vietnam War and whose collection of dreams includes a very high proportion of physical aggression (76.3%, in 97 reports). In the four sets of dreams from “Beverley” from 1986, 1996, 2006, and 2016, the first set has much more physical aggression (11.9%, in 253 reports) than in the other three (5.7%, in 687 reports), which accurately reflected her involvement in that earlier time period with a violent religious cult.

To help shed light on the role of culture in dreams of physical aggression, the SDDb also includes sets of dreams from non-Western people, which can be analyzed in the same way. For the Mehinaku people of the Amazonian rain forest, a collection of 383 dreams had 22.5% with at least one reference to physical aggression. For a group of Nepalese college students, their dreams (535) had 18.1% with a reference to physical aggression. Three groups of African church members reported dreams (142) with a 19% frequency of physical aggressions. These findings are close enough to the SDDb baselines overall figure of 17.6% to suggest that culture is not a decisive factor in this aspect of dream content.

Concluding Insights

Aggression appears to be a normal feature of human dream content, across different cultures.

Men seem to have more physical aggression in their dreams, although some women have high levels, too.

Dreams of physical aggression can accurately reflect actual aggressions in waking life, so an unusually high level of dream aggression, or a sudden change in dreams to a higher level of aggression, might be a therapeutically valuable sign.

Many dreams of physical aggression do not, however, reflect actual experiences of aggression. These dreams may use violence as a metaphor (e.g., a dream of physical attack as a metaphor of feeling emotionally vulnerable). They may reflect instances of fictional aggression (e.g., seen in a movie). They may be anticipations of violence that may happen at some point in the future (e.g. a threat simulation).

Aggression in dreaming can be viewed as an internal form of play-fighting—the most common form of play in the animal kingdom, and very frequent among humans, too. Play-fighting functions as a way of preparing for future challenges, and also for diminishing and defusing emotional tensions that can lead to actual violence. The same psychological dynamics of play-fighting seem to be operative in dreaming, too.

 

Note: this post first appeared in Psychology Today, May 31, 2021.

Posted on

Christmas Dreaming

Dreams during the holidays bring happy memories, and recurrent anxieties.

The holiday season brings many anticipated pleasures, and many reasons for worry. Our dreams about Christmas express both happiness and anxiety, eagerly looking forward to the holiday but also expressing recurrent worries about every possible thing that could go wrong.

The Sleep and Dream Database (SDDb) includes 184 dream reports of 5+ words in length in which “Christmas” is mentioned at least once. Below are excerpts from a few of these dreams (identifying details have been removed). Without delving into the personal meanings of these dreams, we can still read them as fascinating commentaries from the unconscious on Christmas as a collective cultural experience.

Good times. The most positive Christmas dreams emphasize feelings of togetherness, play, and creativity.

“Dreamed about family Christmas time. Brought back happy memories of getting together with brother and sisters.”

“In my dream I was back home. It was Christmas break and my brother, his roommate and I were on a plane going home. When we got there, I went back to my high school and got to see all my friends again.”

“We were all in a hotel for Christmas. I don’t know why but it was a little sad. After a while, we walked outside and it began to snow. We all picked it up and had a snowball fight. It felt like a perfect day.”

“I dreamt that me and some other girl were singing in the living room to this Christmas music. We were trying to put “Away In a Manger” to a rap beat!”

“I was given a box with small parcels in it. I realized that this was a Christmas present. The dream became lucid and I thought, “This is a Christmas dream.” I was doing housework at the same time and noticed a bare Christmas tree in the house alongside a wall. I thought that it needed decorating before the party I would have that night.”

Misfortunes. Dreams also remind us of how very many things can go wrong during the holidays.

“My husband wants to plug in a string of Christmas lights that have a short circuit in them, or rather the switch in the wall does. The lights go on and off. I suggest he try another switch or plug.”

“I had a dream that it was Christmas Eve. My boyfriend and I arrived at my mother’s home in the afternoon and she wasn’t there, she didn’t show up till 5:30 because she was at the gym. This meant dinner wouldn’t be served till later than 8 which is when my boyfriend and I have to leave for a trip to his parents’ home. I was extremely irritated throughout the dream.”

“It was the night of my school’s Christmas pageant, and I was running late–very late. The pageant was supposed to start at 7:30, and I didn’t start dressing for it until 7:45. When I finally headed out the door, I was already a half hour late and I suddenly realized that I had no idea what I was supposed to do when I got there.”

“I was out Christmas shopping in a huge crowd and I got lost and couldn’t find my way out of the store.”

“I was buying trying a Christmas present for a family member but wherever I went it was out of stock or they didn’t have it.”

“I’m going to a Christmas party at my boss’s house, and I manage to spill my coffee, complete with generous amounts of soymilk, all over her couch.”

Nightmares. The holidays can bring out deeper fears, too.

“As a child, and a few times as an adult, I had a recurring dream at Christmas time, initially happy, involving spinning Christmas trees with colored lights. The multiple trees begin to spin faster, then unite into a single, large tree, and come closer. The dream turns darker, and the tree begins to be threatening, a whirl of pine needles and colored lights. Eventually I get sucked into the tree, and wake up in a sweat. To this day I use only white lights on my Christmas trees.”

“I was about 5 years old, and it was Christmas Eve. I was lying in bed, in the top bunk, and when I looked over at the bedroom door, there was a skeleton standing there, with a red Santa hat on, and a bag slung over its shoulder, as if full of gifts.”

Visitations. The most poignant Christmas dreams recall loved ones we have lost, and whose presence we miss most at this time of year.

 “Last week I dreamed that my brother and I were wrapping Christmas gifts. He ran out of wrapping paper and asked if I had any. I didn’t think I had any left but miraculously pulled out a roll and handed it to him. Just as I did this I woke up. My brother died many years ago. He lived in another state and would visit for a week every Christmas. Every time he came he would wrap all his gifts in my wrapping paper which irritated me.”

“I dreamed that my mom (who is deceased) and I were going out to the stores and shopping for Christmas. I didn’t want to wake up, because if I did then she would be gone again. The dream seemed really real.”

“My grandmother passed away recently. My dream was about us baking cookies. I believe the dream comes from the many memories I have of us doing that at Christmas.”

Conclusion

These dream reports were provided mostly from American adults, most of whom are Christians. Given the universality of dreaming, we can predict that people who are members of non-Christian religious traditions also have dreams about their most sacred holiday celebrations, and these dreams also range across the emotional spectrum from happy anticipations to anxious nightmares.

Note: This post first appeared in Psychology Today, 12/14/20.

 

Posted on

The New Dream Studies and the Wall Street Journal

Dream researchers are creatively deploying a variety of big data technologies to open a new era of oneiric discovery.

An article appeared earlier today by Robert Lee Hotz, science reporter for the Wall Street Journal, titled “New Insights into Dreams and What They Say About Us.” It’s a great article, well-written and thoroughly researched, and quite fair-minded towards the scientific study of dreams. (The article can be found here, if you have WSJ access.)

Here is my favorite line:

“While still highly experimental, the new dream studies underscore the power of data mining to assemble unexpected insights by sifting through large data sets of seemingly unrelated information.”

That is very well put. Exciting possibilities beckon on the horizon, and yet much more work needs to be done in mapping the multidisciplinary terrain between here and there. Hopefully others who read the article will recognize these potentials and contribute their insights to this dynamic, though still “highly experimental” realm of inquiry.

I always want to get people more enthused about the study of dreams—but not too enthused. To my great relief, Hotz concludes the WSJ article with some cautionary words (my own included) about the need for greater ethical evaluation and awareness of the possibly harmful abuses of these technologies.

Two follow-up notes from the article.

First, the survey of dreams in relation to the Black Lives Matter movement and recent protests against racial injustice involved 4,947 American adults, completing an online questionnaire designed by me and administered by YouGov on June 15-19, 2020. I am currently working with Michael Schredl on an article analyzing the responses to this survey. An early preview of the results appeared in a post I wrote for Psychology Today on June 25, 2020. The data from this survey are not yet available in the Sleep and Dream Database, but they will be soon.

Second, to the question of “How many dream reports from how many people are in the SDDb?” I gave the estimate of more than 26,000 dreams from more than 11,000 people. I obtained those figures by using the SDDb’s advanced word search tool and defining the data set as all reports with a minimum word count of 5, which yields a result of 26,498 dreams from 11,346 participants. There are surely many additional dreams in the database of less than five words, but many of those reports include “non-dream” answers (such as “no,” “don’t remember any”), which are important to preserve but shouldn’t be counted in overall tallies of the actual dreams. There are also some non-dreams of more than 5 words, but not enough to alter the basic estimate of 26,000 dream reports currently in the database.

Posted on

Basic Patterns in Dreaming

The basic patterns of dream content are coming into sharper focus, thanks to new technologies of digital analysis. By using these tools to study large and diverse collections of high-quality dream data, and then making those tools and data publicly available, we can illuminate recurrent frequencies of dream content that others can easily review, replicate, and verify for themselves. The more we know about these basic patterns, the more we can gain helpful insights from people’s dreams regarding their mental and physical health, social relations, cultural interests, and even spiritual beliefs.

When I began this line of research in the mid-2000’s, I used the resources of the Dreambank.net, a site managed by G. William Domhoff and Adam Schneider. In a paper from 2009, “Seeking patterns in dream content: A systematic approach to word searches,” drawing on the resources of the Dreambank, I included this passage in the conclusion:

“Until researchers have gathered many more high-quality reports from a wide variety of people (ideally accompanied by multiple sources of biographical data), we cannot make any definitive declarations about the universal features of human dreaming. But the results of this study suggest several testable hypotheses:

  1. Dreaming perception is primarily visual, with less hearing and touch and almost no smell or taste.

  2. All emotions are represented in dreams, with fear the most frequent.

  3. Many types of cognitive activity occur in dreaming, especially those associated with awareness and social intelligence.

  4. Aggression is more frequent than sexuality, and both are more frequent for men than for women.”

Today, these same hypotheses can easily be tested with the resources of the Sleep and Dream Database (SDDb). The simplest method is to use the SDDb’s built-in word search template of keywords. The word search function has a template of forty categories of dream content, including categories for specific types of perception, emotion, cognitive activity, and social interaction. Starting on the “Advanced Search” page, I would define the data set for this purpose by setting a word limit of 25 words, and then select a category from the keywords menu. Looking at perceptions first, the following results can be generated in a few moments:

Out of a total of 20,510 dream reports of at least 25 words in length, reported by a total of 7,335 people, a word relating to visual perception appeared at least once in 34.6% of the reports. For hearing, the figure was 10.7%, for touch, 13%, and smell and taste combined only 2.7%. Eleven years later, I would still stand by that first hypothesis.

Turning to emotions, the results of the same simple search process (define the data set as having a minimum of 25 words, and selecting a category from the keywords menu) are just as predicted. A word relating to fear appears at least once in 18.2% of the dreams. Anger appears in 7.1%, sadness in 3.7%, happiness 6.5%, and wonder/confusion 14.4%. This hypothesis seems pretty solid, too.

Cognition in dreaming is harder to study for various reasons, but the word search method can still offer some interesting results. A word relating to thinking appears at least once in 41.9% of the dreams. Some kind of speech or verbal communication appears in 37.6%, and a reference to reading or writing in 7.6%. These findings support the basic idea that dreaming has a fair amount of cognitive activity, with plenty of social communication, though more detailed studies are needed to tease out the variations between dreaming and waking cognition. The third hypothesis is worth keeping.

Social interactions in dreaming are also difficult to study, so the results here should be regarded with extra caution. Indeed, the hypothesis from 2009 may not bear contemporary scrutiny, particularly around gender differences. (When defining the data set, gender can be selected as a search variable from the constraints menu.) The SDDb word search approach yields a finding of at least one reference to physical aggression in 20.8% of the male dreams and 17.2% of the female dreams. That’s a difference, but not a huge one. With the category of sexuality, the male dreams had at least one reference in 5.8% of the reports, versus 6.6% for the female dreams. This is the reverse of the predicted difference. The results of this quick analysis confirm that overall references to physical aggression occur much more frequently than references to sexuality, but the results do not support the 2009 hypothesis about higher frequencies of both kinds of content in men’s dreams.

There are other ways to study these questions with the tools of the SDDb. For example, the “baselines” function provides the frequencies on all 40 categories for a specially curated subset of 2,094 male dreams and 3,227 female dreams. These baseline frequencies provide a kind of measuring stick for dream researchers—a more precise way of determining the average frequencies of particular types of dream content and comparing them to other sets of dreams, which might have content features that vary from the baseline patterns in interesting ways. That shall be a topic for another post.

Note: This post first appeared in Psychology Today on September 4, 2020.