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Jerk is an involuntary muscle spasm that occurs as a person is drifting off to sleep, It is defined as an involuntary twitch that tends to happen just as you are about to step into dreamland.
Hypnic jerk: Why Do I Twitch When I Sleep?
What is a hypnic jerk? Why some people twitch awake before falling
Hypnic Jerk: Causes behind Twitch Sensation While Falling Asleep
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Hypnic Jerk: Why Do I Twitch in My Sleep?
Why do we jerk before going to sleep?
What are hypnic jerks and why do they happen?
What Are Hypnic Jerks and What Do They Mean?
Have you experienced this “jerk” before? #hypnagogicjerk #sleep
