I dream when I sleep every night, but not when I change my bed? What's going on here?

Go back and see if your bed has crossed the ceiling beam (some houses will).

When sleeping, your head must not face the window and your head must not face west (if you sleep like this, the geomagnetic field will pass through your body from the left and affect your heart).

Of course, it is also possible that you put your hand on your chest when you sleep, so you will definitely have many dreams when you sleep.

And sleeping position. Don't look up at the door.