REM (rapid eye movement) sleep is a stage of semi-deep sleep. How much deep sleep do you need? And is it good for you? The experts explain.
USA TODAY, USA Today: Entertainment
Sat, 03/25/2023 - 2:00am
REM (rapid eye movement) sleep is a stage of semi-deep sleep. How much deep sleep do you need? And is it good for you? The experts explain.