Sleeping only six hours a night for a week in a row will make you feel on that eighth day as if you'd gotten no sleep at all. Seven and a half to eight hours remains the sweet spot. (Sanjay Gupta)

Sleeping only six hours a night for a week in a row will make you feel on that eighth day as if you'd gotten no sleep at all. Seven and a half to eight hours remains the sweet spot.

Sanjay Gupta

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day eight eighth half hours night row seven six sleep sleeping spot sweet week remains

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