1 doctor weighed in:

Normal to have sudden onset of hard myoclonic jerks while awake but relaxed? Entire body.

1 doctor weighed in
Dr. Keshab Paudel
Internal Medicine

In brief: May be normal

Myoclonus refers to a quick, involuntary muscle jerk.
For example, hiccups are a form of myoclonus. So are the sudden jerks, or "sleep starts, " you may experience just before falling asleep. These forms of myoclonus occur in healthy people and rarely present a problem. If you believe this is a myoclonus and gives you a problem, i would suggest you to see your pcp.

In brief: May be normal

Myoclonus refers to a quick, involuntary muscle jerk.
For example, hiccups are a form of myoclonus. So are the sudden jerks, or "sleep starts, " you may experience just before falling asleep. These forms of myoclonus occur in healthy people and rarely present a problem. If you believe this is a myoclonus and gives you a problem, i would suggest you to see your pcp.
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