Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
240
You forget 90% of your dreams.
256
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15
Cows can sleep standing up, but they can only dream lying down.
745
People who sleep late have more mental stamina and can outperform early risers.
33
47% of people have a nightmare at least once a month.
186
The average cat sleeps about 2/3 of the day.
203
Honeybees never sleep.
276