One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
Termites work 24 hours per day and they do not sleep.
57
You burn more calories sleeping than you do watching television.
348
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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