!!ADDENDUM!! Thanks to @wolfcl0ck 's comment, I realized I made an error! This dude will pursue the player pretty much EXACTLY 5 MINUTES after spawning. I kept pausing in my recording and forgot not to count that in the timer. Oops.

This thing is no joke. It'll spawn when your Stamina gets low, and stare. Waiting for its time to strike. You'd best get some sleep, maybe grab a cup of coffee...

I'm unsure if this thing has a proper name, and it's colloquially known as the "Sleep Deprivation Demon"... I'm a bit hesitant to call it a demon, so I opted for "Creature", and "Entity" in the video. Whatever the case, I hope you enjoy this dance with the demon... er, creature. Entity. Thing.

If you want to face this horrifying creature (or just sleep well like a normal person)...
Here's a download link. Voices of the Void is FREE: https://mrdrnose.itch.io/votv
... and if you like it enough, you can purchase it (name-your-own-price) or join MrDrNose's Patreon. (I'd recommend either. This game is cool.)