I've been taking Ambien 10 mg.s for about three weeks. While it makes me sleepy and allows me to fall asleep, I still wake up 3-4 hours later. I've taken it with melatonin (5 mg) and I STILL wake up 3-4 hours later. I had the same result with the CR version. If you've had it fail, what HAS worked? BTW I have textbook perfect "sleep hygiene" so there is nothing else to do there.