A few nights ago I was woken at 3:30 am by what sounded like someone shaking our vertical blinds vigorously. I woke DF thinking someone had broken in and made him go check it out, which he did, no-one was in the house and nothing was missing but the bathroom light was on and the door was closed. DF was the last one in there and swears he definately turned the light off and left the door open.

Any idea's? If it was a spirit (don't know what else it could have been), why would they shake the dining room blinds and leave a light on and door closed, it just seems odd.
Maybe they were just trying to make it's presence known?