I was having increasing cramps, bilaterally, involving feet, ankles, and knees. Also had in my hands, wrists and began going into forearms. Occasionally my calves. Weird thing was I would cramp on both sides of the joint so it was difficult to stretch out of. They often started when I got into bed or during th night. Doc thought might be related to my neuropathy. Magnesium level was fine. Decided to take magnesium fly donate 240 mg twice a day. After 6 months they are virtually gone. Stopped the magnesium and hand and foot cramps started to return. Now I take 240 mg a day and haven't had a problem. Isupposedly the fly image form is better absorbed.
Good luck. I hope you get relief and good sleep in the future. We all need this to deal with pain during the day.