Stage 4
During REM sleep, brain activity picks up, nearing levels seen when you’re awake. At the same time, the body experiences atonia, which is a temporary paralysis of the muscles, with two exceptions: the eyes and the muscles that control breathing. Even though the eyes are closed, they can be seen moving quickly, which is how this stage gets its name.
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Similar ideas to Stage 4
Sleep Stages
- Stage 1. Your breathing slows as well as your heartbeat, eye movement, and brain wave activity. Your muscles begin to relax.
- Stage 2. Your breathing, heartbeat, and brain wave activity continue to slow. Eye movements stop.
- Stage 3....
Stage 1
Stage 1 is essentially the “dozing off” stage, and it normally lasts just one to five minutes.
During N1 sleep, the body hasn’t fully relaxed, though the body and brain activities start to slow with periods of brief movements (twitches). There are light changes in brain activity associated ...
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