People who have disrupted circadian rhythms suffer all kinds of negative effects, including higher rates of obesity, sleep ...

Dr. John Cacioppo, the world’s leading social isolation researcher. His statement sounds loud in the ear when you take i ...

REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

Spending lower proportions of time in two deep sleep stages — including REM sleep — may be linked to volume changes in ...