Sleep

Daytime sleepiness is linked to higher body weight. Men with chronic sleepiness have consistently higher BMI, while women, especially younger ones, gain weight faster when sleepiness increases over time.

Humans evolved to co-sleep, benefiting bonding and safety but with mixed effects on sleep quality. Cultural norms and individual needs influence bedsharing, which varies across life stages, with unclear long-term developmental or health impacts for children and adults.

Northwestern researchers found that a smartphone app using sensory cues significantly increased lucid dream frequency. Participants experienced nearly triple their usual rate of lucid dreams, showing that the Targeted Lucidity Reactivation method is effective outside the lab.

People with insomnia experience heightened morning hyperarousal, especially after poor sleep. This link suggests that improving sleep quality may help reduce daytime hyperarousal symptoms in insomnia.

Daily energy drink consumption among students is linked to shorter sleep duration, poorer sleep quality, and increased insomnia symptoms compared to those who rarely or never consume energy drinks.

A study found that higher stress levels in university students led to increased bedtime procrastination, resulting in shorter sleep duration and lower sleep quality. Bedtime procrastination mediated the link between daily stress and poor sleep outcomes.

Objective sleep data has confirmed that evening types take longer to fall asleep, especially those with a history of depression.

A new study reveals that exposure to morning sunlight is linked to improved sleep quality later that night, while the total time spent in sunlight has little effect.

A recent study found that individuals who had near-death experiences reported more frequent and vivid dreams, including lucid dreams, out-of-body experiences, and precognitive dreams, compared to those who hadn’t come close to death, suggesting altered consciousness influences dreaming.

A study found that adolescents exposed to more parental conflict experienced lower sleep efficiency and more wake episodes in emerging adulthood, linking family stress during adolescence to long-term sleep problems. The findings highlight lasting impacts of parental conflict on sleep.

Researchers discovered a brain mechanism during sleep, called BARR, that silences neurons in the hippocampus to reset memory pathways. This process prevents overload, allowing the brain to store new information without exhausting neural resources.

A study reveals that political party affiliation influences sleep quality, with Republicans in Arizona sleeping better than Democrats and Independents, especially during the COVID-19 pandemic.

A study on parabolic flights found that while participants reported better sleep after experiencing brief weightlessness, objective data showed their sleep was actually more fragmented, revealing a surprising disconnect between perception and reality.

A study reveals that more REM sleep early in the semester predicts higher test anxiety before exams, suggesting that "dream sleep" may influence how students experience stress during academically challenging periods.