I had good luck with Geodon and it didn't give me insomnia - even helped with sleep. I haven't taken it on regular basis for a few years, but I still take it from time to time if the auditory stuff pops up. I even found it helpful just to take one or two nights until the problem went away. For me, it works within a few of hours or taking it. Now I only take it when I need it - maybe 2 or 3 times a year - and I never need it for longer than a week.

For long term, Risperdal worked pretty well for me, but caused some weight gain. I took that every day for about 18 months and it kept the hallucinations away the whole time. It also improved my mood and kept my bipolar mania under control. Good luck.