Bats sleep 18-20 hours per day.
5
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
The average cat sleeps about 2/3 of the day.
203
Cows can sleep standing up, but they can only dream lying down.
745
The average person falls asleep in seven minutes.
115
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23