Sea otters hold hands while sleeping so they don’t drift away from each other.
104
You forget 90% of your dreams.
256
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Bats sleep 18-20 hours per day.
5
Honeybees never sleep.
276
You burn more calories sleeping than you do watching television.
348
People who sleep late have more mental stamina and can outperform early risers.
33
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23