Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
The average person falls asleep in seven minutes.
115
47% of people have a nightmare at least once a month.
186
Lack of water is the #1 trigger of daytime fatigue.
148
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
Cows can sleep standing up, but they can only dream lying down.
745
Sea otters hold hands while sleeping so they don’t drift away from each other.
104