Page 3 - Sleep Stages - Medical News and Research Articles

Sleep-tracking devices have limits. Experts want users to know what they are

Your watch says you had three hours of deep sleep. Should you believe it?

Jan 26, 2026

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Social standing and isolation shape sleep quality in mice, study finds

While some factors that improve or reduce the quality of sleep are relatively well understood, many are not. Given the impact that sleep is known to have on matters such as stress, concentration and cognitive abilities, it ...

Jan 21, 2026

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Cannabis use in chronic pain linked to more deep sleep but less REM sleep

The most frequently reported reasons for medicinal cannabis use are for pain relief and improvements in sleep. Although cannabis is believed to have an interconnected role with both pain and sleep, its effects on chronic ...

Dec 17, 2025

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Dopamine neurons also work while you sleep to strengthen skills, study reveals

Dopamine neurons—the cells that drive reward and motivation while we're awake—become surprisingly active during nonrapid eye movement sleep right after we learn something new.

Dec 8, 2025

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Why undisturbed sleep is important to brain injury recovery

A new study highlights how important uninterrupted sleep is to recovery after a traumatic brain injury, finding that fragmented sleep in injured mice is linked to a loss of rapid-eye-movement (REM) sleep and increased fatigue.

Dec 2, 2025

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Why does putting back the clocks an hour disrupt us so much?

The disruption of sleeping and waking patterns from the daylight saving clock change reveals a great deal about our everyday reliance on the interaction of sleep pressure and circadian clocks.

Oct 25, 2025

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When we dream, does our brain wake up?

An international consortium of researchers has created the largest-ever database compiling records of brain activity during sleep and dream reports. One of the first analyses of the database confirmed that dreams do not occur ...

Oct 22, 2025

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Deep sleep supports memory via brain fluid and neural rhythms, research finds

Researchers led by Masako Tamaki at the RIKEN Center for Brain Science in Japan report a link between deep sleep and cerebrospinal fluid, the clear liquid that surrounds and supports the brain and spinal cord. Published in ...

Oct 17, 2025

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Instructions help you remember something better than emotions or a good night's sleep, scientists find

A good night's sleep has long been understood to help us consolidate new memories, but we don't understand how. Associations with negative feelings like fear or stress can improve recall, but intentionally trying to remember ...

Oct 7, 2025

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