One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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The average person falls asleep in seven minutes.
115
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
You burn more calories sleeping than you do watching television.
348
The human brain is more active during sleep than during the day.
28