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
Dieters who sleep more take off more fat that those who sleep less.
159
Honeybees never sleep.
276
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
You forget 90% of your dreams.
256
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29