Anyone wakened by spasm or jerking of muscles might benefit from more magnesium. I need about 800-1000 mg per 24 hour period. This was suggested by a neuro 30 years ago when Zanaflex was impossible for me to take. I really believe many are magnesium deficient. If you try it, remember that magnesium is can encourage diarrhea. The neuro told me to find the one which caused the least diarrhea. A good side effect of taking magnesium is that I rarely have constipation now, whereas it was a constant companion in the old days before magnesium. I take an equal amount of calcium but not at the same time as the mag (I take the cal between meals). And D3 of course. If I forget any part of this routine I will find myself jerking from the hip, clear down the leg,
in bed. This does interfere with sleep. I usually sleep well. Only lately has it been a problem because I am having neuropathy in my feet from taking Interferon. Oh that I'd stayed with just my first two diseases, and not the third one I'm taking INF for.