Recently seen a floating smoke in the apartment?

I recently entered out of curiosity at netflix conjuring and saw the trailer suddenly, as if nothing came out, just a floating smoke and hovered to the left and right and true suddenly and when I lay down in bed around 10pm and the light turned off the door opened by itself and the television was true again I prayed in God's name and then true all right again you know what that could mean do you believe in the supernatural? I'm a very believer always just before I go to sleep I read the Bible and pray to Jesus and always say our father in your name

Simple optical illusion, at best. In the worst case, a cloud of smoke from defective electronics, but then you would have smelled the typical smell of broken electronics.