Random Sleep Facts

    42 facts tagged with Sleep Facts

    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
    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
    One reason that kittens sleep so much is because a growth hormone is released only during sleep.
    212
    Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
    240
    The human brain is more active during sleep than during the day.
    28
    A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
    23
    The higher someone’s I.Q. the more likely they are to be sleep deprived.
    29
    Lack of water is the #1 trigger of daytime fatigue.
    148