FYI, if you want to go the cheaper route, buy tylenol and benedryl separately. Combine, and you have Tylenol PM. If you don't need the tylenol to go to sleep, just take the benedryl. If you just need tylenol for pain, just take the tylenol. If you need both to really lay you out, take both, but when you buy separately, you save money because you have the extra flexability. Plus, you can buy the off-brand drugs.
Ryan