Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22
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
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
You forget 90% of your dreams.
256
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
You burn more calories sleeping than you do watching television.
348
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29