So it was you then! Well, I'm telling you, you're gifted as a voice actress, if it's not something you're doing as a pro already, you should definitely consider it. The writing was perfect too, but it wouldn't have worked so well if the delivery isn't up to par. Instead, it was so comforting, reassuring, caring, and delivered so naturally that I could easily imagine you standing there "in the dark", looking out for me.
Also, I (sort of) know the feeling, I'm also recording my Youtube videos at night, constantly worried about waking up my flatmates. :)