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Dude you talk about using it to get high and then like in the same sentence you talk about it not working for staying asleep. Obviously its not going to work well when you do that.
Ive only used ambien for recreation and it was really great, but i think a healthy sleep cycle is one thing essential for happy living and would never fuck that up by becoming dependant on pharmaceuticals.
I think you should ask yourself more about why your not sleeping all nite. Definitely dont use xanax and ambien on top, its just not needed. and DONT SNort it, your just going through unneeded pain for not that much of a boost. Ambien is a drug, if your going to use to get twisted, you dont need it all at once.