what's that supposed to mean?

Yesterday morning I woke about 7 hungover. After doing a few things in haze I went back to bed and dreamed I walked into a public single-occupant bathroom. I went to the sink to wash my hands and felt a presence behind me. I look in the mirror and see my 2nd self floating in the upper back right corner smiling menacingly at my first self. I am seriously creeped out and turn back to the corner and the 2nd me is not there. I turn back to the mirror and 2nd self is there and sucks 1st self up into corner. I physically try to resist this and I wake up.