You burn more calories sleeping than you do watching television.
348
People who sleep late have more mental stamina and can outperform early risers.
33
Sea otters hold hands while sleeping so they don’t drift away from each other.
104
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
Cows can sleep standing up, but they can only dream lying down.
745
The average cat sleeps about 2/3 of the day.
203
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212