I love Ambien CR!! I was on regular Ambien before they came out with the CR and it would put me to sleep within 20minutes of taking but I would wake up 4-5 hours later. However, with Ambien CR, I would go to sleep after 20 minutes of taking and stay asleep all night. But I had to take it early enough so I could get at least 8hours of sleep or I would be extremely groggy the next day. I can't take it now because I am pregnant but I sure do miss it! Hope it works for you :)