A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
Lack of water is the #1 trigger of daytime fatigue.
148
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
Bats sleep 18-20 hours per day.
5
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
Dieters who sleep more take off more fat that those who sleep less.
159