I'm not sure Ambien is addictive in the typical sense of addiction, however, my stepmother is an addict- but an addict to a particular feeling. She abused Ambien, Xanax and alcohol, sometimes all at once, and in more recent times always one drug or the other with alcohol at the same time. She'd take Ambien, more than her prescribed amount, then drink a bunch, stagger around and not go to bed, slurring her speech, acting ridiculous, going into rages over nothing, was constantly in a state of paranoia, the whole bit, until she just passed out. She liked the feeling of depressants, it didn't matter how she got them. Her father is an MD and she would just call him and he'd prescribe her what ever she wanted. She has done this for years and years and years, except she didn't mix alcohol with it until about 4 years ago. For a long time she would take a sleeping pill, but stay up so she could feel the "effect", and act really bizarre, then claim she had insomnia and had been up for days because she "couldn't" sleep, and we all believed her and chalked up her crazy behavior to lack of sleep. Really the truth was she forced herself to stay up. If she couldn't get ahold of any pills, she'd just stay up for days on end until she felt the same as she did either on pills or drunk. When she started adding in the alcohol, my Dad started seeing what was going on, he'd come home from work and she'd be passed out on the kitchen floor and he couldn't wake her up. He found bottles of alcohol and beer hidden in weird places, sometimes empty or full, the same with pills. She's been in and out of rehab- inpatient and outpatient and finally now has been sober 4 months. She would go in stints, sober for a month, go on a binge, sober for 2 months go on a binge. She never made it past 90 days until now.
So addiction problems can happen to people even with drugs that aren't addictive in the typical sense. My stepmother's addiction is psychological, not physical, if that makes sense.