There is a drug called "amyltriptaline" which has been know to reset people's sleep cycles. It's an older med. It is a tricyclic antidepressant combined with a sedative. When I took it this drug kept me on a regular, nine hour a night sleeping schedule for about six months, then it quit working. I'd always been a hard core insomniac, though. There are other drugs and supplements that help with this problem. I'm taking a supplement called "black seed oil", and I seem to be sleeping longer and harder on it. Then there is a supplement called "melatonin", if you're not familiar with it, that is supposed to be good for resetting sleep schedules. You might ask your pdoc what he recommends for sleep problems.