Has anyone seen an entity that looks human, but has no face?

10 years ago, when I went to bed I dozed off for about 2 minutes when I suddenly heard something moving by the window to my right.

I looked at the window and i noticed that the blinds curved upwards, as if something were between the blinds and the windowsill.

As I regained my senses I realised to my horror that a figure was crawling in through the window. I laid there in horror not knowing what to do, apart from staring at it. It was pale and had long brown hair.

The moment I stared at it, it stopped in its tracks. On all fours it slowly moved its head towards me, and I shit you not, it had no face! It was completly smooth where the face should have been, like a mannequin. I jolted out of my bed and ran out in the hallway and took my baseball bat. I barged in to my room and there was no one there and the window was closed.

By the way I live on the third floor, with no fire escape.

A couple of weeks later I sat on the balcony during sundown, when suddenly something catched my eye. On the roof on the opposite building, I saw a head peak up, and a couple of seconds later it slowly went down and disappeared.

Of course there could be logical explanations for all of this. Maybe I hadn't fully woken up yet. And the head peaking up could have been a bird... it wasn't sleep paralysis because I could move the whole time.

But to this day it scares me.

Someone told me it could have been some kind of forest spirit. Have you ever seen anything alike?