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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).
This gets straight to the source: sleep regulates your leptin and ghrelin levels (ghrelin is the hormone that tells your body you're hungry). Not enough rest and your body starts producing ghrelin and not producing leptin. So hit the hay in time to get about 8 hours every night.