insomnia
"I was on halcion for almost 5 years until I built a tolerance and it stopped working.  Since then I have tried numerous medications of various types and none have worked as well as halcion.  Most have not even been close or didn't work at all.  With halcion, I fell asleep quickly and naturally, and stayed asleep at least 6 hours.  It was a restful sleep with no side effects like dreams or strange behavior.  I had no problems waking up or functioning the following day.  It's only now that I can't find a substitute that I really appreciate the benefits of halcion."