Many people are dismissive about bad dreams, often shaking them off or forgetting them by morning. However, recent research indicates that the content of your dreams, including the unsettling moments, may influence your emotional well-being more than previously understood.
A recent study from the University of Kansas, published in the journal Sleep, examined a leading theory in dream research: that fear experienced in dreams acts like exposure therapy, helping people process and manage difficult emotions in waking life. The findings, however, revealed a more complex picture than a straightforward confirmation of this idea.
More Data = Better Questions
Garrett Baber, a doctoral student in clinical psychology at the University of Kansas, led the study with researchers from several other institutions. The team collected dream reports from 536 people, covering more than 4,700 days. They used a custom language model to measure emotions in each dream, focusing on fear and joy.
“We wanted to apply new methods with bigger data,” Baber said. “We had a much larger sample than a lot of studies use and used some advanced statistics to apply a more rigorous approach to testing why we dream.”
The dataset’s size allowed the researchers to use Bayesian multilevel modeling, a statistical method that accounts for variation within and across individuals over time. This approach represents a significant improvement over the small-sample studies that have been common in dream research.
Fear in Dreams = Worse Mornings
On a daily basis, the exposure therapy hypothesis did not fully hold. Frightening dreams were associated with a worse mood the following morning, rather than an improved one. However, the results differed when the researchers examined patterns over longer periods.
Participants who reported using more adaptive emotion regulation strategies, such as accepting emotions instead of suppressing them, tended to experience more fear in their dreams on average. In other words, those who were better at managing difficult emotions were also more likely to experience frightening dreams.
“In the short term, more fear in dreams is associated with worse mood,” Baber said. “But at the individual level, people who are better at handling their emotions tend to have more fear in their dreams.”
This difference between short-term and individual-level effects suggests that the relationship between dream content and emotional health occurs across multiple timescales. Daily mood fluctuations may not fully reflect the broader impact of dreams.
When Fear and Joy Coexist
One of the study’s more novel findings concerned dreams that contained both fear and joy simultaneously. The researchers found that emotionally complex dreams, with high levels of both joy and fear, were associated with a 20% higher likelihood of waking up without a negative mood the next morning.
“We found when dreams contained both fear and joy at the same time, people were less likely to report negative mood in the morning,” Baber said. “This was a novel finding. It suggests that emotional complexity in dreams may have a protective effect.”
Joy in dreams also had its own independent effect. Higher average dream joy was associated with a more positive mood the next morning.
An Open Question
The study does not determine exactly when emotional processing takes place. Earlier theories suggested it happens during the dream. Baber’s research raises the possibility that these effects may occur later in the day, after waking, or that the presence of mixed emotions within a dream could serve as a form of emotional regulation.
The findings show that not all distressing dreams are alike. Baber points out that chronic nightmares, which are severe enough to wake the sleeper, are often linked to mental and physical health problems and require clinical attention. However, the average bad dream may represent something different.
“Chronic nightmares are associated with negative outcomes,” Baber said. “But the average bad dream might actually be a sign of the brain’s resilience.”
Austin Burgess is a writer and researcher with a background in sales, marketing, and data analytics. He holds an MBA, a Bachelor of Science in Business Administration, and a data analytics certification. His work focuses on breaking scientific developments, with an emphasis on emerging biology, cognitive neuroscience, and archaeological discoveries.