Nope I dont think I've ever sneezed in a dream. Alot of times sneezing is just a random thing so I don't think it will just happen but maybe you might sneeze if you are allergic to something. If you are allergic to cats then when you see one in a dream you might sneeze. IRL I sneeze alot coming out into bright sunlight but I've never done that in a dream. I don't remember ever coughing or yawning either.