Early this year, I was having trouble with waking up at 3 - 4 and not being able to go back to sleep. Occasionally a Tylenol PM will help a lot. I was taking Benadryl every night before going to bed also, which helps.
Tylenol PM contains 25 mg of diphenhydramine, which is the active ingredient in Benadryl (50 mg).

Ibuprofen is known to help with sleep, too. I think ibuprofen (Advil) is a miracle drug (if your stomach can take it). But I think some people take more than is necessary. I don't take it often, but when I do, I only take one and it always works.

Karen