Sleep Science & How Sleep Works

Understanding how sleep works is the fastest way to sleep better. Your body moves through distinct stages every night - light sleep, deep restorative sleep, and REM - each doing a different job for your brain and body.

The guides below break down what actually happens while you are unconscious, why deep sleep matters so much, how your internal body clock and melatonin govern when you feel tired, and what the research really says about how much sleep you need.