Cows can sleep standing up, but they can only dream lying down.
745
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
People who sleep late have more mental stamina and can outperform early risers.
33
A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
6
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
The average cat sleeps about 2/3 of the day.
203
47% of people have a nightmare at least once a month.
186