"i have taken ambien (10mg) on several occasions for short periods of time and it worked just fine (knocked me out in 20min and gave me 5 to 6 hours of sleep). but, my doctor recently added ambien cr to my nightly cocktail and it has not worked like the doctor or the website said it would. i have been taking it for a week. i expected it to knock me out and keep me asleep. i have done everything like i have been told to do and have been taking it before bed and all it has been doing is taking 3 to 4 hours to knock me out and makes me totally loopy in the morning. the effect is basically lengthened and delayed. i am hoping to switch back to original ambien  formula when i see the doctor next month!"