Zolpidem
"My Dr. in NYC took me off of Halcion (which worked great!) and put me on Ambien when it came out being touted as a "miracle sleep aid". Doc told me that it was non-habit forming, if it worked for me I wouldn't ever need to use more than the 5 mg. tabs (sounded like she had just memorized company literature). Anyway the .5 mg. Ambien worked great for a while, especially helpful as my work schedule(s) varied so much. I'd sleep and wake up refreshed. But after 7 or 8 yrs. of taking .5 mg several nights a week, I needed 10 mg. to get & stay asleep. Then it stopped working. Fact is, you have to go off Ambien for a while until your "tolerance" goes away & I'll bet that's the case with all sleep aids - it's back to Halcion for me!"