I also had the sleep problem and it got worse with my recent surgery -- I used to go to sleep anywhere, instantly -- Now I was finding myself half-awake until O-Dark-Thirty and then I would sleep all day, it seemed.

During my immediate post-radiation period, I even tried Ambien and it didn't make a dent.

I now take a cocktail of ibuprofen (for my wrist/hand), melatonin, benedryl and a prescription, ancient anti-depressent (Trazadone) that has a side effect of drowsiness, which works for me.