insomnia
"I was having severe insomnia to the point where I was only getting 1-2 hours, at the most, of sleep a night. I started to hallucinate after a few days of this and was prescribed Ambien. It works fast (within 10 minutes after kicking in to fall asleep), but I only sleep 4-5 hours on it and then wake up refreshed. I don't get my full 7-8 hours. Not sure what's up with that. I tried Ambien CR and it took longer to fall asleep on that and I still only got around 4-5 hours of sleep on the CR version. I still use Ambien and it's better than Lunesta which gave me a nasty taste in my mouth and didn't even make me tired. Overall, I recommend Ambien."