I’m 5.5 weeks post op and still sleeping in a reclined position, although not as upright as you’re meant to at the very beginning. I’m still swollen so the nurses saw at my 3 week post op check said to continue sleeping in a reclined position for now, and also to stay in my M&S post-op bra until at least 8 weeks post op.
I’m relatively comfy at night, although I do wake up periodically because I’ve slipped down the bed a bit!