20 Fascinating Facts about Sleep

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  • Men have dreams about other men 70% of the time, whereas women dream about women and men equally.
  • Sleep deprivation is linked with lower libido and less interest in sex in both men and women.
  • We can only dream about faces we have already seen.
  • Parasomnia is a sleep disorder involving abnormal movements, behaviors, emotions and perceptions, even though you are asleep.
  • Clinomania is the excessive desire to stay in bed.
  • Somniphobia is the fear of sleep.
  • 12% of people dream in only black and white. This number used to be higher, 75%, before the invention of colored television.
  • People who do not dream at all generally have personality disorders.
  • 41% of adults sleep in the fetal position.
  • 1 in 4 married couples sleep in separate beds.
  • Divorced, widowed and separated couples report the most insomnia.
  • British soldiers were the first to develop a method to stay awake for 36 hours without sleep; upon fatigue, they would put on special visors that emulated the brightness of a sunrise and it would keep them awake.
  • The longest sleeping mammal is the koala bear, totaling 22 hours a day.
  • The shortest sleeping mammal is the giraffe, sleeping a total of 1.9 hours a day (in 5-10 minutes sessions).
  • Humans may be the only species that can’t keep half of our brain awake.
  • Humans sleep around three hours less per night than other primates, such as chimpanzees, rhesus monkeys, and baboons, all of whom sleep for 10 hours.
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