insomnia
"I've been taking Ambien/zolpidem for about 15 years now.  I am 55 years old and have had sleep issues as long as I can remember.  My brain just doesn't turn off at night without it.  I use the 10mg dosage but I cut the tip off so that I actually only take about 8mg nightly.  With 10mg I get 6-7 hours of wonderful sleep, but it leaves me with fog-brain for a couple of hours the next day.  With 8mg, I get 5-6 hours of sleep and wake up refreshed and clear headed.  The last few times I had the bright idea to get off the zolpidem, I lay awake most of the night wondering why I would want to get off such a great medicine.  I have had no side effects that I know of."