More specifically, diphenhydramine HCL usually in 25mg tabs. Benedryl is just a brand name for the same drug that can be bought much less if people understood what they were ingesting. As an antihistamine, it's effects as far as drowsiness are pretty significant.
Zolpidem Tartrate (Ambien) is considered effective over time, however, dependency is high. That means actually seeing a doctor on this would be the wisest advice with diphenhydramine one of the safer alternatives as long as the dosage isn't exceeded.