I would avoid AP's if you can. I know when my quetiapine has been reduced, the adjustment phase is a horrendous ordeal. I have said before that I would also avoid AP's for sleep troubles if you can. If that's all you need them for.
But if you do go for a low dose of an AP maybe Aripiprazole as I have a friend who has success on that one. It just didn't work well for me. And if you feel too energised ask for a switch. If you go down this route that is. There are a lot of people who take a low dose of 25mg of quetiapine for sleep, anxiety or depression. Chances are you will put on a little weight with any AP. Doctors will try Risperidone for the least weight gain but it made my mood worse. I have a high tolerance and Risperidone was just euch! I hated it.