Heidi has been looking into this phenomena for quite a while.
https://heidihollis.com/hat-man , https://heidihollis.com/shadow-people
https://www.coasttocoastam.com/show/2025-11-18-show
The Karyn Reece Show - Heidi Hollis on the Hat Man and Shadow People https://www.youtube.com/watch?v=aNeVMb41xAc
https://www.youtube.com/results?search_query=+Heidi+Hollis+on+the+Hat+Man+and+Shadow+People