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
Bats sleep 18-20 hours per day.
5
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
Those who get out of bed by 7am are more likely to be thinner and happier.
20
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34