The human brain is more active during sleep than during the day.
28
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Lack of water is the #1 trigger of daytime fatigue.
148
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
Those who get out of bed by 7am are more likely to be thinner and happier.
20
Cows can sleep standing up, but they can only dream lying down.
745
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23