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Switch That Says It's Time to Sleep Identified

The switch in the brain that sends us off to sleep has been identified in a study in fruit flies. The switch works by regulating the activity of a handful of sleep-promoting nerve cells, or neurons, in the brain. The neurons fire when we're tired and need sleep, and dampen down when we're fully rested. Although the research was carried out in fruit flies, or Drosophila, the scientists say the sleep mechanism is likely to be relevant to humans.
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