I did a search on this forum, as I know pred insomnia is a frequent topic. Some have had success with Tylenol PM, Benadryl while others have to go to prescript
ion-strength sleep aids in order to get some relief (e.g.,Ambien). Contact your GI and I am sure they can prescribe you some good stuff so you can get some rest.
Here's one topic I pulled up in my search:
https://www.healingwell.com/community/default.aspx?f=38&m=2411271