Trazodone for difficulty falling asleep?

I've been having trouble getting to sleep at night-- just seems like I can't shut my mind off. I talked to my doctor about it and he prescribed me trazodone to take before bed. I researched it a bit, and it seems like trazodone is primarily used to treat depression and anxiety. I'm already on another anti-anxiety medication and a bit nervous about adding trazodone to the mix. Has anyone else ever been prescribed trazodone as a sleep aid? What kinds of results/side effects did you have?