How many hours of sleep do most adults need for optimal health?
Most adults need 7-9 hours of sleep each night to function at their best.
What is the name of the hormone responsible for regulating sleep?
Melatonin is the hormone that helps regulate sleep by controlling the sleep-wake cycle.
How long does a full sleep cycle (from light sleep to REM) usually last?
A full sleep cycle lasts about 90 minutes, repeating several times throughout the night.