The third stage of non-REM sleep is the deep sleep stage, which our bodies need to wake up feeling refreshed and restored. Short bursts of electrical activity in the brain may still characterize this stage of sleep. The second non-REM stage involves a drop in the body’s temperature, the heartbeat and breathing become slower, and the brainwaves slow down further. This is the phase during which our bodies may twitch as we enter slumber. The brain changes its electrical oscillations from the active, wakefulness pattern of brainwaves into a slower rhythm.
In the first non-REM stage, the body and brain transition from wakefulness to sleep. The first three form the so-called non-rapid eye movement (REM) sleep and the fourth one is REM sleep - where dreams occur. Scientists generally agree that there are four stages of sleep that we cycle through several times each night. Share on Pinterest We round up the neuroscientific evidence that helps explain the intricate workings of the human brain when it is asleep.
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