Sleep

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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Increase Your Beauty: Get Enough Sleep
That advice may sound like it falls into the same category as Always tuck a tissue up in your sleeve, you never know when you'll have to blow your nose...
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Stockholm > Sweden