Bats sleep 18-20 hours per day.
5
Those who get out of bed by 7am are more likely to be thinner and happier.
20
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
You burn more calories sleeping than you do watching television.
348
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Honeybees never sleep.
276
People who sleep late have more mental stamina and can outperform early risers.
33