One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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.
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