insomnia
"Ambien is something I have very mixed feelings about. 
To be honest I was hooked on it the first time I took it. 
It took me a year to realize this. 
It is an extremely subtle dependency that develops, but eventually it will stop working. When it stopped working I started feeling like I didn't get quality sleep at night at all and was dizzy all the time. I think it has a very subtle withdrawal that many people might not understand.
Terrible, I will be up for 3 days straight at a time, it's been two months off of Ambien and I sleep worse now then I ever did before I had it.
My advice is take it EXACTLY as it's prescribed no long term."