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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).
Sure, we sleep because we are sleepy. But why do we get sleepy? And why after about 16 hours? Why not one hour, or 60 hours? It's not that the brain is resting. In fact, when we sleep, networks in the brain undergo very organised patterns of activity â and use almost as much energy as when we are awake.