Hi Gillian
I found the pillow post-surgery was very helpful. Lucky I got 2 banana shape from hospital at that time. the pillow also help when I put it underarm while I went out for shopping (I went out a lot right after surgery and during chemo)
When it sits underam, it relief the pressure from the shoulder to the tissue. So at first I thought the banana pillow was small and light, however it works wonderful. I carry it like underaming a handbag. I also carry it throughout the night.
Another things about insomanial, Mmmmm, I did this way : I thought to myself, why have to sleep in the night time. I am sick and rest at home, I could arrange my time anyway I like. I could work in the midnight, and sleep in the day time. I tried to not worry myself because woke up in the midnight, that normally everyone should sleep. Try this way, don't fiorce yourself to sleep if it awake, do something yourself, reading, watching a movie, do some clean (if allowed) or even yoga, let it be just in the day time. And then when in daytime, you might enjoy a nap after yoga and shower, or a movie or a meal. Just play around 24hours yourself. I hope this could help.
Take care (big hugg)
Rosanna