I was prescribed 15mg mirtazapine but told to start out with 1/2 tablet. The pharmacist told me with this med, lower doses work better for sleep. The 7.5mg did help me sleep through the night but I felt totally drugged up for 3 days so never took it again. I'm taking 100-150mg trazodone and it helps me fall asleep but I wake almost every 2 hrs through the night and sometimes have trouble getting back to sleep.