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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).
Other sleep scientists point to research that suggests that sleep replays and consolidates significant memories. Some recent research points out that during sleep, some nerves send their electrical impulses in the opposite direction they normally do when you are awake. We're not too sure why they do this.