It's cold. It's hard to breathe.

Your situation is very similar to mine. I have also summarized that a large part of it is psychological action, which gradually forms habits and then becomes spontaneous conditioned reflex.

Later, every time I did this, I would take a deep breath, take a deep breath and tell myself that it was okay.

Try not to wear accessories when sleeping. It's much better to go to a well-ventilated place when you are uncomfortable.