This happened about two weeks ago, and it was nighttime. I was lying in my bed and looking towards a large window in my room. My bed is close to the window, and I have a low shelf with a TV in front of the window.

It has been cloudy lately, so it isn't as dark outside. I have a digital clock next to my bed, so there is a light from that. The hall light was also on.
Overall, it wasn't really dark in my room. I could easily see if I needed to go out for something.

I remember staring towards the window, when I see a black shadow move in front of the TV, then quickly disappear.
I also want to add that the space between my TV and bed is quite small, so whatever I saw was about two metres away from me.

I also have the need to stare at the corner of my room multiple times before I fall asleep too. There looks like a darker spot in that corner that makes me really uncomfortable and like I'm being watched if I don't look at it.