insomnia
"I have been taking 2mg for 2 years.  My initial dose was 0.5 mg, but until I took 2mg it would not help me sleep.
 If I have an extremely stressful afternoon/evening, my doc said I could take 2 tabs (4mg), as long as I don’t take that dose more than twice a month and not on consecutive days. 
I get between 6 1/2 - 8 hours of great sleep per night and feel very rested and energetic each day. I am a very active, athletic person and feel no hangover effect from it. I just feel like I have my life back after sleeping no more than 3 hours per night for 8 years. 
I have a friend who has taken it for 8 years with the same results as me.  Neither of us take any other medication."