Mirtazapine
"I have been taking 15 mg Remeron (lately just 7.5mg) for about 5 to 6 weeks primarily to help with insomnia since I was taking Ambien previously for 2 months and couldn't get any more of it and wanted to stop taking. The first few days the drug produced intense somnolence, lack of motor skills and impaired abilities. However, this went away after 3 days or so. It helped with sleep the first 2 to 3 weeks producing noticeable sedative effects but that has stopped since week 3. I have been a bit lazy as of late and also have gained 8-10 pound; the drug makes me crave carbs.  I may stop taking the drug once my second prescription runs out due to the laziness and it no longer helps put me to sleep. I wake up very groggily still."