I go through stages of not sleeping, and have in the past(before mg) had problems, but they are worse now. It all started with the high doses of pred, and I would have night sweats and not sleep. I was put onto sleeping tablets by my GP, which worked well, as lack of sleep makes my MG worse. If I'm having only a minor problem, I use a tablet my Pharmacist recomended(I have a great rapore with him) called restavit.
Talk to you Dr, as they might have some ideas, hope you get some answers.
take care