A Parallel World !

Do parallel worlds exist?  Look at this:

I live in the ground floor of a wooden apartment (which has three floors). Somebody lives just above my apartment who always creates some sort of noise…. Stuffs falling, heavy stamping.. From my observation, he works from home and that too at night. When I am in the hall, he stamps and pounds just above me.. At night, when I rest in my bedroom, he too moves to his bed room and starts pacing or stamping just above me creating creaky noises and mild ‘bangs’.

I am convinced that parallel worlds do exist !