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
Bats sleep 18-20 hours per day.
5
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
The average cat sleeps about 2/3 of the day.
203
The human brain is more active during sleep than during the day.
28