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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).
RE: What happens when you fall asleep with a concussion? I know that people can go into a coma if they fall asleep with a concussion, but what happens as a result of sleep that causes the coma? Why is it they don&#39;t fall into a coma why they are awake?