Sleeping fewer than six hours may impair your ability to perform simple tasks – regardless of whether or not you feel rested. The small study by Brigham and Women’s Hospital found most people do not notice the effects of under-sleeping, and even report feeling alert, but underperformed when tested.

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Sleeping fewer than six hours may impair your ability to perform simple tasks – regardless of whether or not you feel rested. The small study by Brigham and Women’s Hospital found most people do not notice the effects of under-sleeping, and even report feeling alert, but underperformed when tested.