Really cool aesthetic and style. Love the simplicity. It's a style that has been done before, but you utilized it very well. I really liked the way you showed the guy turning around and getting up during the night to indicate the effect of the evil presence. The end result was certainly shocking, but maybe it should have been a bit more subtle. Like instead of the fingers just poking through the guy's face violently, maybe it could be more of a thing with quiet possession or the monster just finally grabbing him, but now killing him, it should be more psychological. The looping aspect of the gif means it could all be a dream or something, meaning he doesn't really die, but all gifs loop and this is still too literal for that. If you were going for that maybe you could have shown him getting up then. But that would kinda ruin the effect of his previous wake-up.
Overall, a cool Halloween gif, but needs a bit more subtlety.