I was on it for 4 days only because I quit as it made me drowsy throughout the next day still, or not even drowsy but, cloudy in my head. The sleep effect however was incredible, it was wonderful I could actually sleep through the night with very few interruptions. Just too icky the next day for my liking.
IS it something you are trying for prolonging sleep, and possibly dealing with nightmares? Because I'm not taking Trazodone at night which helps slightly to sustain sleep, even though I still wake up loads, but I can go back to sleep faster than without the drugs. I don't know what your reason your taking it for, if its for its antidepressant effects, or to help with sleep. Also Zopiclone is AMAZING for sleep initiation but doesn't do much for prolonging sleep. But this is my miracle pill to get me asleep in the first place and not 3 hours with out it. I love zopiclone if you have trouble falling asleep its fantastic.
Also if nightmares are a big concern, and sleep, there is a new drug tested specifically on PTSD sufferers, called Prazosin which is actually a high blood pressure pill, but it is supposed to greatly help sleep concerns for PTSD particularly nightmares.
Just throwing this out there because I know remeron (aka mirtazapine) is often used to aid in sleep as well as anxiety/depression in the longer term