It’s a bit late for me now but my fiance had a great idea last night. Just after my op I found that I was more comfortable sleeping on the sofa or in the spare room but if the duvet slid off then I had to call him (poor sod) and get him to cover me up, also I found that my shoulders got really cold and I didn’t want to wear my dressing gown to sleep. His solution: a sleeping bag. I haven’t tried it (I’m nearly 7 weeks post op so am lying down and alsorts now) but I really think it’d work.