You forget 90% of your dreams.
256
The higher someone’s I.Q. the more likely they are to be sleep deprived.
29
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
Cows can sleep standing up, but they can only dream lying down.
745
Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
Those who get out of bed by 7am are more likely to be thinner and happier.
20
The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
15