insomnia
"I have been taking Ambien for about a year now.  I have two sleep problems:  I have difficulty falling asleep and 2) when I do manage to fall asleep, I usually wake up about 2 hours later and can't get back to sleep.

I haven't noticed Ambien having any effect at all on the first problem.  (It's 7:40 am as I write this, and I haven't been to bed yet.)  But it does help with the second.  When I finally do manage to get to sleep, I usually sleep for a good 7 or 8 hours.

Different people respond to this medication in different ways.  Be very careful about taking it until you know how it affects you."