Sleep Basics
Functions / Theory
100

This stage includes light sleep.

What is Stage 1 NREM?

100

This theory suggests that sleep is necessary to "fix" the body, clear toxins, and repair tissues used during the day.

What is restorative theory?

200

The circadian rhythm typically lasts approximately this long.

What is 24 hours?

200

Studies show that a person can go around this long without sleep

What is 3 days?

300

This stage is associated with vivid dreaming.

What is REM sleep?

300

REM stands for....

What is Rapid Eye Movement?

400

A full sleep cycle typically lasts this long.

What is about 90 minutes?

400

Approximately this many sleep cycles occur in a night

What is 4-6?

500

These brain waves dominate deep sleep.

What are delta waves?

500

This system conducts waste clearance on the brain during sleep (cleans the brain) 

What is the glymphatic system?