You forget 90% of your dreams.
256
"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
You burn more calories sleeping than you do watching television.
348
Cows can sleep standing up, but they can only dream lying down.
745
Bats sleep 18-20 hours per day.
5