A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "morning".
11
The average cat sleeps about 2/3 of the day.
203
The strangers in your dreams are actually people that you've seen in real life.
50
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
The human brain is more active during sleep than during the day.
28