Human sleep is a cycle which consists of waking stage, Non-REM Sleep and REM (Rapid Eye Movement) Sleep. In the waking stage, your body will prepare you to sleep.

Your body will start to slow down, your muscles start to relax and your eye movements will slow down. After the waking stage, you will come to Non-REM Sleep which comprises of 4 stages and lasts from 90 – 120 minutes. In stage 1, the sleep is called drowsiness. The eyes are closed once you are in this stage. But if you are aroused from it, you might feel as if you have not slept. Stage 2 is the light sleep period. In this stage, the polysomnographic readings will show intermittent peaks and valleys, or positive and negative waves. These waves indicate spontaneous periods of muscle tone mixed with periods of muscle relaxation.
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