Cute observation. We all have a few endearing foibles, its nice to have someone to notice. Its clear the N. and the blanket thief have this kind of relationship.

You may want to try to snip a few words and retain this feel.
I smile
to see sheets wrapped
around your insistence
of seventy degrees--
you sleep better,
after all, while cold.
Not meaning to mess with your poem, but just to give an example of attempted brevity.
Thanks for posting.

T