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Sleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli, and is more easily reversible than being in hibernation or a coma.

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Are there people who do not sleep at all?

The known record of time without sleep is 11 days, 24 minutes. There might be some who claim that they don't sleep, but it was never proven or documented any official form. … If the person actually came into a lab, their sleep state could be measured with an EEG and other tools. …
Yosi Dahari's user avatar