I went to the pharmacy and bought some 50mg diphenhydramine tablets, appropriately called "Sleep Eaze". I used to use these a lot, but to the point I became dependent on them and was taking 2 every night at one point. Not had any for years so should at least make me drowsy. I will add to my nightly diazepam dose, and also plan to dose 20mg amitriptyline which also sometimes helps. Probably a bit risky but so is having 5 hours sleep out of a week.