The human brain is more active during sleep than during the day.
28
Cows can sleep standing up, but they can only dream lying down.
745
A new baby usually deprives each of it's parents around 350-400 hours of sleep in the first year. That is one entire nights sleep per week, per parent.
194
You burn more calories sleeping than you do watching television.
348
If you hold farts in during the day, they'll just come out when you sleep.
16
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The average cat sleeps about 2/3 of the day.
203
44% of kids watch television before they go to sleep.
106