Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
28
Lack of water is the #1 trigger of daytime fatigue.
148
Bats sleep 18-20 hours per day.
5
People who sleep late have more mental stamina and can outperform early risers.
33
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
47% of people have a nightmare at least once a month.
186
Cows can sleep standing up, but they can only dream lying down.
745