Hopefully your psychiatrist can advise you how to lessen the withdrawal symptoms. There could be various ways to do it. I know when I was going off Geodon I had terrible withdrawal symptoms, though not so much related to my sleep. My psychiatrist just had me wean off of it very very slowly. Maybe you're reducing the dose a little too quickly? Or maybe tecomsin has a possible solution mentioning transferring to a sedating med. Or some other method? Your psychiatrist should definitely advise you properly.