A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
Termites work 24 hours per day and they do not sleep.
57
Lack of water is the #1 trigger of daytime fatigue.
148
The average person falls asleep in seven minutes.
115
44% of kids watch television before they go to sleep.
106
The human brain is more active during sleep than during the day.
28
Honeybees never sleep.
276