Trazodone
"For 10 years I took a 50 mg of Diphenhydramine at bedtime.  It helped me to get to sleep most of the time.  Then it stopped working.  Now I take Trazodone and it works much better.   My initial dose was 100 mg and I slept fitfully with mild hallucinations.  I decreased the dose to 50 mg and slept much better with some dreams all pleasant and no nightmares.  Now I take 25 mg at bedtime, and another 12.5 mg (1/4 pill) if I wake up during the night.  I've been on this regimen for three months and have not had any side effects; I wake up refreshed and don't feel sleepy in the mornings."