I get strong Myoclonus/Hypnic Jerks, but only when daytime napping. I rarely ever have it occur at night. No idea why. I’ve yet to find anything that directly influences it one way or the other.
My wife, who has Parkinson’s, gets the same thing during nighttime sleep. Hers are very strong and seem to vary depending upon her medication dosages combined with levels of Mucuna pruriens she is working with, whether four or five per day. Interestingly, the strength and quantity of her Myoclonus seem to have little to do with the levels of her waking tremors.