The Taps in the Wall

I need to write this down because if I don't say it out loud to someone I feel like I'll convince myself it didn't happen. I live alone and about two weeks ago I started hearing tapping on my wall, three taps, always three, always around 3am. First few nights I thought it was pipes or the building settling, old apartment, that kind of thing happens. But then one night the tapping came from inside my closet, not the wall, the closet, and when I opened it there was nothing there, just my clothes hanging still, no draft, no reason for anything to move. I stood there for way too long just staring into the dark space behind the hangers. The following week I woke up gasping like something had been sitting on my chest, and for a second, right before I fully opened my eyes, I swear I saw a shape crouched at the foot of my bed, thin, too tall for how it was folded up, and it was gone the moment I blinked. I told my sister and she said it was probably a dream, but I wasn't asleep, I was already awake staring at the ceiling when it happened. I've since started sleeping with the lights on, not because I'm scared of the dark, but because I'm scared of what shows up in it.