insomnia
"I had a concussion as a result of a fall.  I was diagnosed with Post Concussion Syndrome.  I could not sleep at all.  Tried everything over the counter, then prescriptions including Ambien.  Nothing worked.  I went to the Dr. several times and told them I needed something to make me sleep or was going to lose my mind.  Trazadone 100 mg per night and I sleep like a baby.  It is a miracle!"