What are the different stages of sleep?

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TL;DR

There are two main types of sleep: 1. Non-rapid eye movement (NREM) – also known as quiet sleep, 2. Rapid eye movement (REM) – also known as active sleep

Table of Contents

There are two main types of sleep:

  1. Non-rapid eye movement (NREM) – also known as quiet sleep
  2. Rapid eye movement (REM) – also known as active sleep

NREM – Stage 1

  • The beginning of the sleep cycle and is a relatively light stage of sleep.
  • During this stage, the brain produces high amplitude theta waves, which are very slow brain waves.
  • This period of sleep lasts only a brief time (around five to 10 minutes). If you awaken someone during this stage, they might report that they were not really asleep.

NREM – Stage 2

  • People become less aware of their surroundings.
  • Body temperature drops.
  • Breathing and heart rate become more regular.

NREM – Stage 3

  • Muscles relax.
  • Blood pressure and breathing rate drop.
  • Deepest sleep occurs.

REM Sleep

  • The brain becomes more active.
  • Body becomes relaxed and immobilized.
  • Dreams occur.
  • Eyes move rapidly.

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https://www.sleepfoundation.org/articles/sleeptionary-definitions-common-sleep-terms https://www.sleepassociation.org/about-sleep/stages-of-sleep/

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