I too suffered from hypnic jerks, past tense. It was my medication that was causing them, taking magnesium out of the system. I would get them when trying to fall asleep and just before you dose off, they would jerk you awake again. one night I jumped out of bed with one scary. Too much tea coffee and alcohol would also take magnesuim out of the system. I would get them real bad on a Sunday night if I was out drinking Saturday night. Now I take magnesium citrate two hours before bed 400mg with a snack, magnesium by solgar best quality. Not that expensive for a month's supply. Cut back on tea coffee and alcohol.