Has your Dr mentioned trying Trazodone before Mirtazapine? I've been taking Trazodone for sleep for over a year. I started at 50mg and now take 100mg. It's an anti-depressant with a side effect of sleepiness. I was waking up frequently during the night, so tried switching to 7.5 mg of Mirtazapine but only took it one night. It helped me sleep through the night but I felt groggy and tired for the next 3 days so stayed with Trazodone. Trazodone has a half life of 5-13 hrs, while Mirtazapine's half-life is 20-40 hrs. My routine now is taking 2.5mg Melatonin before bed, which helps me fall asleep. I wake up 1-2 hrs later and then take 100mg Trazodone which helps me sleep a few more hours. A helpful website with user reviews on both drugs (and other sleep meds) is Drugs.com. Google the name of the med you want to research and add "for sleep reviews" after it and the website should come up.