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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).
The richer, more compelling, or just plain odd dreams seem to occur during the REM cycle, and it's this stage of sleep that the body seems to seek. If you lose a half hour of REM sleep one night, you'll likely make up for with 35% more REM time the next night, a phenomenon known as REM rebound.