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During the night, you cycle through five separate stages of sleep every 90 to 110 minutes, experiencing between three and five dream periods each night. The five stages of sleep can be distinguished by changes in the electrical activity in your brain, measured by electroencephalogram (EEG).
What Happens During Sleep? We spend (or at least are supposed to spend) a third of our day sleeping. Sleep is much more than a passive activity; we need that time to clear our minds and restore our bodies. If we donât get enough rest each night, we become cognitively impaired, just as if we had been drinking alcohol.