insomnia
"I have been a sound sleeper most of my life until I was 65 and began waking up after about 1-1/2 hours sleep most nights and was unable to get back to sleep.  After over a year of this I was always tired and had no stamina.  I began taking Zolpidem 10mg every night at bedtime and was able to get 5 to 5-1/2 hours sleep almost every night.  After a month I had normal energy and stamina (for my age).  The only drawback is that I would prefer 7 to 7-1.2 hrs sleep which I only attain once or twice a week on the Zolpidem 10mg.  I am going to discuss the newer slow-release version with my doctor for the next refill.  It has made a significant improvement in my life and activities."