Yes I had that problem when I was on Lamictal (and some other mood stabilizers as well). I know since I had trouble falling asleep in addition to sleep disruption I was prescribed the sleep aide Rozerem which is non addictive and actually adjusts the sleep cycle like melatonin but I don't know if it would be prescribed for sleep disruption but you could ask your psychiatrist.
All these medicines make life good and wrong in diferent ways, my Daughter had been triying to fin once that world for her for the last 3 years, be careful