Sleeping difficulties

I wondered how others with secondary cancer and in treatment cope with sleep. I have struggled since diagnosis 18 months ago with secondary at outset. I’m on 3rd chemo course in that time on carboplatin and gem carb.
I’m tired physically with 4 children; 18 m, 3, 12,14 but hard getting to sleep and wake early hours. I take zopiclone but not v effective now. Have taken other sleeping tablet lorazepam but gave me nightmares.
I’ve tried relaxation but doesn’t seem to help mind.
Any tips ?
Thankyou Jo x

I am on mirtazapine which is an anti depressant. Helps promote sleep, you take it at night, and promotes appetite. Can’t recommend it highly enough
X Sarah