Galway girl, I think you hit on the solution when you were talking about cannabis, but if you live somewhere it's viewed with hostility then I'd stop trying to use antidepressants for sleep, leave them to sort your mood and get some benzos just for a short course, that could get you a few nights sleep.
Obviously that is only my opinion as a woman with menopause.
I'm on fluoxetine again because it's the most effective for me, sertraline stopped working after a year but it was never as good anyway, venlafaxine and duloxetine were given after that, I guess my GP only half thought about it at the time. Eventually I got fluoxetine on prescription again, 20mg is the only dose I tolerate, same as in another post. It slightly disturbs my sleep, but not by much.
I use a benzo for sleep occassionally, always afraid of getting addicted I take them very infrequently, but all seem to do the trick. Currently I've got clonazepam, but I've used diazepam and temazepam for the same purpose.
I have all the sleep hygene rules nailed down of course, a strict bedtime being the most important one for me, eat enough in the evening and no caffeine after mid-morning.