Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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The human brain is more active during sleep than during the day.
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Those who get out of bed by 7am are more likely to be thinner and happier.
20
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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.
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The strangers in your dreams are actually people that you've seen in real life.
50
Honeybees never sleep.
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