The hypnic jerk occurs when the muscles, usually in the legs (although they can be observed throughout the body), involuntarily contract quickly, almost like a twitch or spasm.
You may have heard it called a “sleep start”, the “hypnagogic jerk” or the “myoclonic jerk”, but for the sake of sanity we’ll just stick with the former. This bedtime tumbling sensation is the phenomenon known as the “hypnic jerk” and may sometimes be accompanied by a visual hallucination. It’s like you misjudged the number of stairs you were walking down, leaving your leg in mid air for just a bit longer than you expected. You climb into bed, get comfortable and cosy, start to feel your brain slowing down … and then suddenly you experience a shocking falling sensation. It should be one of the most relaxing times of the day.
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