I used to work in an ICU. We had a standing order to give benadryl 25 mg and if needed you can give another 25 mg one hour later. At home I buy generic benadryl 25mg and I also take 2 extra strength tylenol with it. It really helps ,with very little after affect the next morning. (tylenol pm has 25mg benadryl..generic... and tylenol in it) but I find it works better using them the first way. Good luck getting some sleep. Also...no chocolate or caffeine after noon for me.