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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).
One way to understand why we sleep is to look at what happens when we don't get enough: 1  As you know if you have ever pulled an all-nighter, missing one night of sleep is not fatal.What we all know is that, with a good night's sleep, everything looks and feels better in the morning. Both the brain and the body are refreshed and ready for a new day. Dreams are another important part of sleep. We'll take a closer look at how dreams work in the next section.