Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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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
Sea otters hold hands while sleeping so they don’t drift away from each other.
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Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
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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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A new baby usually deprives each of it's parents around 350-400 hours of sleep in the first year. That is one entire nights sleep per week, per parent.
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