I had insomnia on Geodon as well. I was on 80 mg in the morning and 160 mg at night.
Call your doctor. Not to scare you, but I started not sleeping on that combination, I thought it was Ambien withdrawl (switching from Ambien to Geodon), and I ended up hallucinating--turns out I was having an unusual reaction.
Take the Geodon earlier and take it on an empty stomach. Taking it with food slows down the time it takes to kick in. I can't take it until 7:30 and need to take it with food or I will be passed out and slobbering at 8:30.