I have used it on occasion in the last 2 years (about 5 nights a month). I take only half a tablet, am asleep within 30 minutes. It doesn't keep me asleep, I usually wake up after about 3 hours but am able to get back to sleep quickly, which I usually can't do. After 6 hours sleep I am not at all drowsy.
in general my sleeping has greatly improved since I stopped drinking (settled down after 6 weeks or so). And yes, physical activity helps enormously.