I T IS HARD to overstate the importance of sleep. Regular hours of rest offer organisms of all sizes a chance to consolidate ...

Certain patterns of brain activity during awakening correlate with a lower likelihood of the bleary-eyed state called ‘sleep ...

Sleep may not just be rest for the mind—it may be essential maintenance for the body's power supply. A new study by ...

Cortisol and melatonin are the seesaw hormones that help with sleep. Cortisol is suppressed at night when melatonin is high, ...

A new study finds that leaking electrons from brain mitochondria may act as a biological switch to trigger sleep under stress ...

Sleep starts when brain cells sense energy overload and release stress signals to protect themselves from harm.