You burn more calories sleeping than you do watching television.
348
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The human brain is more active during sleep than during the day.
28
Termites work 24 hours per day and they do not sleep.
57
The average cat sleeps about 2/3 of the day.
203
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
Cows can sleep standing up, but they can only dream lying down.
745