I was prescribed Zaleplon for occasional insomnia. Now my medical plan "suggests" a less expensive "substitute" named TRAZODONE. A quick research reveals TRAZODONE is an anti-depressant; no specific mention of it's use for insomnia. I already take an anti depressant, Wellbuttrin 300 mg.one daily. How safe will a substitution of Zaleplon for Trazodone be ?