For the study, very short sleep patterns were defined as less than five hours a night, short sleep was five to six hours a night, standard sleep was seven to eight hours, and long sleep was nine or more hours a night.

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If we kept the speedometer at 80 we could do it with a short night's sleep.

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The trouble is that everyone needs to sleep, and even a short morning nap after a sleepless night brings the depression roaring back.

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