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
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
149
You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "morning".
11
You forget 90% of your dreams.
256
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Bats sleep 18-20 hours per day.
5