Random Sleep Facts

    42 facts tagged with Sleep Facts

    Knocker-Up
    Knocker-Up
    Until the 1920s, there was a profession called 'knocker-up', which involved going from client to client and tapping on their windows (or banging on their doors) with long sticks until they woke up.
    46
    Cows can sleep standing up, but they can only dream lying down.
    745
    You forget 90% of your dreams.
    256
    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
    Sea otters hold hands while sleeping so they don’t drift away from each other.
    104
    You burn more calories sleeping than you do watching television.
    348
    One reason that kittens sleep so much is because a growth hormone is released only during sleep.
    212
    Hypnic Jerk
    Hypnic Jerk
    When you wake up with a jolt, it's called a Hypnic Jerk. This usually happens during the lightest stages of sleep, and can happen as a natural reaction when you fall asleep in a car or airplane.
    35