For a good while now, maybe several months, I've had a really hard time falling asleep. I started taking one Benadryl tab to help and it works but last night I took two tabs because I wasn't feeling good and was restless so I knew I wasn't going to sleep well or actually go to sleep. I took those two tabs of Benadryl and fell asleep pretty easy but I woke up like four hours later! I still don't feel very good, I was nauseous and had a migraine every day now for a week or so. I don't know if it's stress doing this or depression or what! Is there a reason the Benadryl isn't working to help me sleep?