Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Honeybees never 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
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
People who sleep late have more mental stamina and can outperform early risers.
33
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28