EV:
If he takes it in the morning, perhaps changing it to night would help. That's how I do my depression meds because they do make me sleepy. My brother was on Geodon for awhile (he is schizophrenic) but he didn't like it. It didn't help him, it seemed to make his paranoia worse along with hallucinations. But then it works differently for different people, so maybe after a bit of time, like our depression meds, give it a few more weeks and if he's still not liking it or the effects aren't slowly going away, maybe you want to change meds. But then it's always a chance for the same thing to happen and you have the 3-4 weeks or more to build up in his system.

Good luck!
Kimberly.