I've just begun a course of mirtazapine and am looking forward to enjoying a good night's sleep having heard great things about sleep quality. Only trouble is it's giving me an upset stomach (diarrohea) only once a day but it's kind of draining me. Only been on it 5 days but am hoping my stomach will settle down soon as I really want this to work. I was on Escitalopram for 18 months and my sleep was practically non-existent on it. Does anyone have advice to give, I would really appreciate any help.