Sleep debt means you don't get enough sleep., The causes are obvious - too much work and not enough rest., Do you ever feel so tires in the middle of the day that you can't keep your eyes open?, You don't need much sleep to recover from the day, but you need enough rest., Some people say the feel so refreshed after a siesta that they can do twice as much., But don't try not to sleep at all - people have died after such experiments!,

too/enough/so/such unjumble

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