Just woke up, I thought I heard my dog having a stretch. When I looked on the floor he wasn't there but I noticed my window was open. I don't remember opening it! I'm currently staying over at my dad's house for a family event. My sister has fallen asleep on the sofa downstairs and she has denied opening it. She is massively tired so has crashed out and would not have come upstairs (to my room) without going to her bed.
Oh as I am typing this my dad just got up to use the bathroom (was hoping it was him) but he just looked at me like I was crazy when I asked him and has denied opening the window. I didn't think it was him as he has always been very paranoid with closing windows at night when the central heating is on. He also wouldn't come into my room whilst I slept.
No one else in the house! Aibu to ask what you think is likely to have happened!
We live in a very quiet/safe cul de sac. The window is very large.