Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
Cows can sleep standing up, but they can only dream lying down.
745
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
The harder you concentrate on falling asleep, the less likely you are to fall asleep.
34
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149