insomnia
"I have used this medicine off and on for 7 years.  All of you who have issues with doing things that you don't remember need to be sure that you are taking it properly.  I have been there and my 24 year old daughter still laughs at the things I have no memory of.. and I own several things I bought at 2 am.  

Finally two years ago I found a physician who took the time to explain how this medicine works and it changed everything.  You must be lying in bed, "ready to go to sleep", with no lights on at all.  Ambien shuts down part of your brain and if you are not waiting to fall asleep lying in bed then after you take it the chemical reaction that allows you to fall asleep so easily also keeps you from remembering things you do. Take it properly."