Have a look on google for information on a thing called sleep paralysis, I'm talking about when you said your girlfriend seen someone in the doorway,it's quite common for people having sleep paralysis to see figures and a lot of the time a woman in doorways or around the room, also disturbed sleep is a big cause of it so maybe her keep waking you up moving places in the bed caused thisspot on that above  c/j ,  I used have illusions   sometimes when I went to bed, thought seen something in the corner of the room, or see the curtain's move  when windows were closed , heard noises   etc  lol, iv