I never share blankets. With anyone. Ever. Unless there’s acute risk of freezing to death.
Or, you know, sex. But for actual sleeping? Never met anyone who likes the heat as much as I do. Fine by me. I’m gonna be all warm and comfy right here, thanks, under this here blanket... polar expedition... and you can be all cool and comfy right there, under that there blanket.... Oliver Twist thin.
Wake up in the morning & 2 flicks settles each blanket and the bed is made, voila.
Know tons of married folk the exact same way. Never thought of it as an issue.