Some people customarily sleep only 1 to 3 hours per night. Some have gone 10 days or more without sleep, apparently without suffering any medical harm. Observations such as these are considered evidence against the theory that

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The observations that some people can sleep very little without apparent harm and that some can go extended periods without sleep challenge the theory that the main purpose of sleep is for the body to repair and restore itself. If sleep were primarily for repair and restoration, we would expect significant negative consequences from such sleep deprivation.

Some People Customarily Sleep Only 1 to 3 Hours Per