insomnia
"been on zolpidem for 10yrs.  Tolerance was so high it became ineffective.  started w/25mg. and kept getting up after about 3-4hrs (half life).   titrated to 50mg for 6 days and still not much better.  went to 75mg and moved time taken from 8:30pm to 9:30 and now when I do get up, I am falling back to sleep quickly.  I have found one needs to give these meds time to work."