benadryl leaves most ppl hungover the next day, myself included. as for the OP, you could ask for samples of different ones, ambien did not work for me, but lunesta did. also, as for the CR/XR vs regular, it depends on what your problem is. if you just need help getting to sleep, then the regular should work fine. if you need help falling asleep and staying asleep, the CR is what you probably need. For me, even if I take a lunesta and get only 5 hrs of sleep, I feel better than I would've with 6+ hours w/o it, because you get good sleep. A good cup of coffee or a coke or something should take care of any sleepiness.