Ambien don't have an effect like Vicodin, it's a Z drug and their mechanism of action is agonist of GABA-α1. In large doses some people tell that could cause hallucinations (but it shouldn't take it for that, don't have sense), and principally have only a strong hypnotic effect. I have this in my Rx and I take it when I have so much troubles to fall sleep, when melatonine or another natural remedies don't work.
In less than 15 minutes with 10mg I almost sleep, but in the morning one could be awaken drastically, because the dream caused by this is artificial. I don't see recreative use in this drug.