anxiety
"Buspirone worked for me in the beginning by eliminating anxiety as well as nightmares.  However, nightmares and anxiety returned and in response my doctor increased my dose.  Now, I experience anxiety at night that has  progressed to paranoia,as well as vivid nightmares.  I cannot stay asleep when I can actually fall asleep.  My mind goes a mile a minute and I have tried meditation and exercise.  On average, I get about 3 hours of sleep a night.  I have even started drinking a glass of wine or two just to calm my nerves. I now avoid going to bed just so I don't have to deal with the anxiety."