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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).
How can our body keep breathing while we are sleeping, when our brain is in sleep mode, and so are all our muscles? I woke up this morning and that question suddenly popped up in my head, and it has been bugging me all day lol. When we are asleep, our brain is disconnected, and our muscles are totally relaxed and in sleep mode too. That is how our body recovers and gets ready to get going again the following day.