Sleep

Think you can sleep fine after a late coffee? A new study suggests otherwise. Researchers found that while caffeine may not prevent sleep, it creates a "shallower" rest by increasing brain complexity and pushing it toward a more wake-like state.

While many people use cannabis to help them sleep, a new study reveals a surprising outcome. Researchers found a single dose of a medicinal cannabis oil actually decreased total sleep time and significantly suppressed the REM sleep (or dreaming) phase.

A new study of Israeli Druze adults finds that religious individuals report better sleep and less anxiety than their non-religious peers. The findings suggest that mental health—particularly anxiety—may help explain how religiosity influences sleep quality.

New brain imaging research suggests that insomnia is linked to abnormal connectivity in brain regions that process sensory information. These disruptions may play a role in the sleep-wake imbalance that makes it so hard for some people to rest.

Hispanic adolescents reported later sleep timing, greater social jet lag, shorter weekday sleep, higher caffeine intake, and more evening screen time than peers. Screen use and stress, but not caffeine, were linked to delayed sleep and sleep misalignment.

The belief that cheese causes nightmares is an old tale, recently revived in news headlines. A new study investigates this claim, revealing a genuine link. The story, however, is more complex than a simple slice of cheddar before bed.

An international study of over 15,000 adults across 16 countries found that dream recall and nightmares became more common during the pandemic, with sleep duration, age, and gender all playing a role in how often people experienced them.

Scientists have discovered that forming a mental map of a new environment takes more than just recognizing individual places—it also requires sleep. The study highlights how weakly tuned neurons gradually become synchronized to encode space as a connected whole.

A new study finds that evening-type teens, who already struggle with depression and irritability, adjust their bedtimes and wake times differently when given longer nights of rest, suggesting that internal body clocks shape how adolescents benefit from more sleep.

A study of adolescents found that sleep regularity moderates the relationship between sleep difficulties and mental health symptoms. Adolescents who had trouble sleeping on one night tended to show more mental health symptoms the following day. However, the effects of...

A new study using data from over 11,000 adolescents found that sleep disturbances were the most powerful predictor of future mental health problems—more so than trauma or family history. AI models based on questionnaires outperformed those using brain scans.

Spending less time in slow wave and REM sleep may accelerate brain atrophy in regions affected early in Alzheimer’s disease, according to new research. The findings support sleep quality as a potential factor in preserving brain health.

Researchers tracked sleep and activity in people with bipolar disorder using wearable devices and found that short-term fluctuations in behavior often appeared days before hypomanic episodes, offering new possibilities for early detection and intervention.

Visceral fat may affect your sleep more than you think. A study using national survey data shows that individuals with higher Body Roundness Index scores have more sleep disorders, and depression explains part of that connection.

A new study reveals that the human brain’s timing rhythms slow down during sleep—but in two different ways. Broadband and gamma signals both change, following opposite patterns across the cortex, offering fresh insight into sleep’s effects on brain function.