I fell alseep for 2 nughts and woke up too late to take the ambien so I skipped it. I didn't take it last night. It's been 3 nights without it. I am not sleeping well anyway I think I have built up a tolerence.I was taking 12.5CR I suffer from chronic pain and recently started the Fentanyl patch and thought it would be better if I could stop the Ambien altogether. Any problems just stopping without tappering?