kcdc's comment about using bendryl is a good idea for most people. Diazepam (Valium) and others like it can be less than effective for some (not me, it really knocks me out, and does wonders for my pre check up jitters, since it's primary design function is anti-anxiety) but people do develop a tolerance to it. Ambien has the shortest lifespan in the bloodstream of all of this class of drugs, and is better for those who wake up a little groggy with regular diazepam. With those of us with xerostomia I would use the benadryl with caution, as it will really dry you up further...its primary function.