You forget 90% of your dreams.
256
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
Cows can sleep standing up, but they can only dream lying down.
745
"Dysania" is the state of finding it hard getting up out of bed in the morning.
33
In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
13
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
The human brain is more active during sleep than during the day.
28