insomnia
"I build tolerance to any medication really quickly, so I will be able to use 10 mg of regular Ambien for maybe a month, then my doctor would up it to 20mg for the next month, and following that he would give me Ambien CR for the 3rd month, and then basically start all over again. I have tried nearly every single other sleep aid available by prescription and non prescription and Ambien has been the only one which works for me. "