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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).
Stage 5 - REM Sleep: REM sleep usually occurs in cycles during the last 5-6 hours of an 8-hour nightâs sleep. So how much sleep we get in this stage will depend on how much sleep we get for the night. During REM sleep, eye movements increase, heart rate increases, and the normal body processes also increase.