Trazodone
"I have had problems with insomnia for years. After 8 years of taking Ambien, which worked great for several years, I built up a tolerance and asked my doctor about switching medications. He prescribed Trazodone, and after reading reviews, I had high hopes for the medication. Unfortunately, it did little to help my insomnia and left me with severe congestion and a headache. After 4 or so hours I would wake up with my mind racing and was unable to sleep. My doctor added klonopin. I feel asleep quickly but rarely got more than 4 or 5 hours of sleep a night. Very disappointed."