Honeybees never sleep.
276
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
47% of people have a nightmare at least once a month.
186
The strangers in your dreams are actually people that you've seen in real life.
50
Those who get out of bed by 7am are more likely to be thinner and happier.
20