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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).
In fact, during sleep, neurons in the brain fire nearly as much as they do during waking hours -- so it should come as no surprise that what happens during our resting hours is extremely important to a number brain and cognitive functions.