Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
Cows can sleep standing up, but they can only dream lying down.
745
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
Sleeping on the job is acceptable in Japan. It is viewed as exhaustion from working hard. Some people fake it to look committed to their job.
57
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
22