Hi Camilla, Mirtazapine is an effective anti-depressant with sedation and increase in weight as its significant side effects. As an antidepressant, there are many alternatives to mirtazapine. Selective serotonin reuptake inhibitors like escitalopram, sertraline, etc are effective and safe. It causes lesser weight gain than mirtazapine but is not as effective sedative. Bupropion has least association with weight gain. However, is also not sedating. As you have mentioned that your sleep problems are triggered by depression, I think starting these anti-depressants with short term sedatives will solve your problem. Sedating anti-depressants include agomelatine and tricyclic antidepressants like amitryptilline. Tricyclics also cause weight gain and also have much more side effects. I do hope this information was useful. You can discuss these drugs with your treating psychiatrist and select the best suited for you. Best wishes.