Nic,
Long before my bipolar and PTSD were diagnosed, I was given Trazadone for depression and sleeplessness. Turns out it does not do much for depression, but I have used it successfully for sleep.
I have been taking it every night since about 1983. I am on 75mg right now, and it does the trick. Within about 45 minutes I am sleepy enough to drift off. Do NOT drive or expect to do anything that requires heavy lifting or heavy thinking after you take Trazadone.
I like it, because I have never had side effects, and it is way better than sleep loss or other questionable sleep aids...It has my endorsement.
I am not a doctor, and this is only personal opinion...