Hi Erin,
My 16 year old son is on neurontin due to Post Traumatic Stress Syndrome following an accident he had a couple of years ago. He takes it for anxiety. He also complains of having nightmares. We have talked with his Dr. about it and he is now on 400 mg in the morning and 400 mg at night. That is down from 800 mg 4 x a day. That has helped alot. His Dr. also suggested he take a Melatonin at night to help relax him. I have taken a melatonin at night myself for years. My son takes 3 mg at bedtime and I take 1 1/2 mg. You might run the Melatonin by your Neuro but my Drs. all know I take it and no one has ever said it could worsen my MG. How many mg's do you take per day and how many times per day? Maybe you could avoid taking them before bed and see if that helps.
Kendra