You forget 90% of your dreams.
256
People who sleep late have more mental stamina and can outperform early risers.
33
The human brain is more active during sleep than during the day.
28
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
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
Bats sleep 18-20 hours per day.
5