insomnia
"I started using Lunesta over 2 years ago after trying Restoril for several months, which would put me to sleep but then I'd wake up at 2 or 3am and not get back to sleep until dawn.  My doctor prescribed Ambien, but that made me have heart palpitations, so she switched me to Lunesta.  The only side effect I've had is the "yucky taste" in my mouth...brushing your tongue and the roof of your mouth upon awakening takes care of that.  The cost is high as others have mentioned, but after years of not getting a good nights sleep, it's well worth it to me."