Could the Way I Sleep Change the Shape of my Nose?

Sleeping in a position that puts pressure on the nose may prolong swelling.  In an ideal situation I would suggest to all my patients that they sleep on their back for 2 months post-operative. That is not a realistic request.  It is very difficult to change our natural sleeping positions and if you are someone who sleeps on your stomach, you will probably not get enough rest if you try to. If you can, try to sleep on your side more and not your stomach

Considering that you are still in the early stages of
recovery, your nose is likely changing shape due to progression in swelling and
healing. There is, however, an ideal sleeping position that I always recommend
to my patients following their nose job. Try to keep your head elevated with at
least two pillows so as to promote blood circulation to the nose. Also, if
possible, sleep on your back as opposed to your side or on your stomach to
avoid excessive contact with your vulnerable, new nose.

A nose will go through changes for several months after surgery.  Sleeping on the nose 6 weeks after surgery might cause a slight increase in temporary swelling but it will have no effect on the long term outcome.