Not too smart

Staying up really really late watching American Horror Story and then, standing in your darkened hall about to go to bed, totally forgetting that the light sensor in the hallway can detect motion inside the apartments too, if it's just inside a door and the door has a peephole. So no, the fact that the lights just went on in the hallway - very noticeable via that very same peephole - doesn't mean that someone standing outside your door just moved. You did that yourself.

Better check all the same, just to be on the safe side.