stopping the neurotonin caused the weight gain you may become physically addicted to the sleeping meds and it will cause rebound insomnia, which i had after discontinuing halcion after 1yrs it took me approx 6 months to start normal sleep patterns, and my tolerance to the medication and my addiction prone mentality caused me to take more and more.. try switching your sleeps meds so you are not tolerant to one maybe a non narcotic like ambien or sonata might help