Hi Patrick,
You should be finished with IMRT, are you?
I had the same experience, I was up every two hours, it was not fun. About a month after the completion of my radiation I had a complete obstruction caused by scar tissue, I had had a radical previous to the radiation and this is a common issue when radiation is performed soon after surgery. Ever since I have been able to sleep again the whole night. I am sure once the effect of radiation have left your system you will also be able to go through the night. It may take a while yet, hang in there, it will get better.
Scott