The human brain is more active during sleep than during the day.
28
Lack of water is the #1 trigger of daytime fatigue.
148
You forget 90% of your dreams.
256
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
Bats sleep 18-20 hours per day.
5
Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
The strangers in your dreams are actually people that you've seen in real life.
50