insomnia
"I have taken Lunesta 3mg for about 5 years now.  Never have had bad dreams or any instances of sleepwalking, etc.  I take it & about 45 minutes later I am fast asleep until my alarm clock goes off.  Prior to finding Lunesta, I had insomnia for years & I cannot tell you how much of a lifesaver this medicine has been!  Tried Ambien but it did not work for me at all.  Also tried Sonata, but would wake up a few hours after going to sleep.  I've had no problems with tolerance, either.  The only "bad" thing is the crappy taste in one's mouth, but I discovered that brushing my tongue when I brush my teeth before going to bed gets rid of 90% of it, along with using Biotene mouthwash (the dry mouth brand).  Hooray!  My insurance will now cover it, too!"