The Science of Sleep Understanding Sleep Cycles and Stages

The four stages of sleep are all unique and occur in 90 minute cycles 4-6 times each night.

Sleep Cycles, Explained

Sleep Cycle Problems: Why I Can't Break the Day-Night Shift

What Happens When You Fall Asleep? 😴

What Happens to Your Body When You Sleep? (Medical Animation)

The science of sleep 😯

Sleep specialist talks about what happens in each stage of sleep

The Holy Grail of Restorative Rest

What Happens During REM Sleep (The Dream Stage Explained)

Wake-Ups Are a Normal Part of Sleep

Waking at 3–4 AM: Why Someone Might Be Thinking of You

Comprendre chaque étape du sommeil : Partie 1

The Science of Sleep: Deep Dive into REM & NREM

Waking Up at 3AM to an Empty House: How to Break the Cycle