Have you ever had a dream where all of a sudden you feel
like your falling, and almost immediately wake up because of it, feeling like
you’ve an intense muscle spasm with your heart pounding? This phenomenon is
called hypnic jerk, and if you’ve felt this before you’re not alone, more than
70% of the population experiences once in their life. A hypnic jerk is an
involuntary twitching of a muscle, or multiple muscles, and they usually occur
just after you fall asleep. The reason you feel a sensation of falling or
jolting, is because your muscles involuntarily twitch as you pass through
different phases of sleep.
http://www.nosleeplessnights.com/the-hypnic-jerk-jolted-awake-when-falling-asleep/
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