About 12% of all people dream in black and white.
People that are born blind don’t dream in images, but in things like emotion, sound and smell.
Some deaf people use sign language in their sleep.
On average, people need 7 to 9 hours of sleep every day to function properly.
If you don’t get enough sleep at night, it’s likely that you’ll want to eat more during the day. Due to a decrease of the hormone that regulates your appetite.
Caffeine is the world’s most popular drug when it comes to giving you that little kick to stay awake. Think about coffee, tea, chocolate and some sodas.
We spend about one third of our lives asleep. You’d better make sure to have a comfy bed.
Some people commit crimes in their sleep, because of parasomnia. Meaning all the abnormal things that can happen to people while they sleep, like sleepwalking.
About 15% of all people are sleepwalkers. Waking them up isn’t as dangerous as they say, but there is no doubt that it’s not going to be fun for the sleepwalker.
About 25% of married couples sleep in separate beds.
Some scientists say that sleep deprivation will kill you more quickly than food deprivation.
Within 5 minutes of waking up, you already forget half of your dreams.
In general, it takes people 10 to 15 minutes to fall asleep. If it takes you less than 5 minutes, you might be overtired and you should get more rest.
Although you’d expect it, fear isn’t the main emotion in nightmares. Researchers found it is more often a feeling of sadness, guilt and confusion.
REM sleep (Rapid Eye Movement sleep) usually begins after about 90 minutes after falling asleep. It occurs in bursts, and in total lasts about 2 hours a night.
Researchers still don’t know if animals dream, like we do. But some animals have sleep cycles similar to humans.
Elephants sleep standing up during non-REM sleep, but lie down for REM sleep.
Cats are famous for their long naps. Two thirds of a cat’s life is spent asleep.
A giraffe only needs about 2 hours of sleep a day. Whereas brown bat needs about 20 hours a day.
Dolphins sleep with one eye open and with half their brain wide awake. In 24 hours, each half of the brain gets about 4 hours of sleep.
Humans are the only mammals that willingly delay sleep.
Going to bed drunk will make you fall asleep quicker. But you won’t get enough rest, as you’ll sleep lighter than normal.
If it’s too hot in your bedroom, you’ll have more trouble to sleep well. As our body temperature has to decrease slightly to fall asleep.
Snoring only occurs in non-REM sleep.
The purpose of dreaming is still a mystery. There are theories though. Some say we do it to sort thoughts and store experiences. But hey, we all know it can be a lot of fun.
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