Hi suedot, drains are so uncomfortable aren’t they! I had a type which did not need emptying but still found sleeping very tricky. Something that helped me is I put a small stool next to my bed and placed the drain upright on that during the night. As after my surgeries I slept on my back due to the drain and soreness, it seemed to stay in place without falling over.
For the daytime, I found a light post-surgery dressing gown with drain pockets from George at Asda (about £16) which was quite helpful for carrying it around for a few days.
Hope you get it removed soon and have a speedy recovery x