While most "night owls" can adjust their sleep patterns with treatment, some people have biological characteristics that ...

or 9 hours) to avoid waking during deep sleep, which can cause grogginess. While individual cycle lengths vary, this approach helps some people wake feeling more refreshed. Temperature regulation ...

Waking up feeling groggy is common after a poor night’s sleep, and many people blame it on hay fever in the warmer months.

Harmer's nose he saw such extensive damage to the lining that he asked the father-of-one if he had been a habitual cocaine ...

Sleep-wake rhythms in normal adults usually have a periodicity of 24 hours, while 48-hour sleep-wake cycles have been ...

You need about 1.5 to 2 hours of deep sleep each night. This is also the stage of sleep when it's most difficult to wake up. Deep sleep is as important as REM when it comes to physical rest ...

There isn’t a single cause of sleep paralysis, but a combination of factors contribute to it. Learn about narcolepsy, mental ...