I know Ambien by itself can have some seriously frightening side-effects, because I have a friend--my brother's former roommate--who had it happen to him.
He'd take it, go to sleep, wake up, and do strange things. There are records at work of him coming in, logging on to the computer, and doing work, but he remembers none of it.
He went out for a drive late one night in one of these 'blank' times, and ran his car into a guardrail enough to total it. Parked it, and found a way home. Got notified by the police the next day, remembers none of this.
And he has no other addictions or drug problems...
Needless to say, he doesn't take Ambien anymore...
