In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
Lack of water is the #1 trigger of daytime fatigue.
148
You burn more calories sleeping than you do watching television.
348
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Cows can sleep standing up, but they can only dream lying down.
745
47% of people have a nightmare at least once a month.
186
Honeybees never sleep.
276