I can’t tell you how many times I had ended up with little to no blankets after sleeping 4 four hours. Eventually, spouse and I decided that we would get two full-size blankets for the bed so that we could each have one. This has prevented so many restless nights.
Yes I can confirm it works. Source: am currently in king size bed in my own 10tog single duvet whilst my husband is snoring away in his 13tog duvet. It’s also great that you get to pick the warmth of your bedding !