I don't think it'll affect him negatively. It will be good to know why he wants to sleep in your room, so you can know if it's something you need to fix. If it starts to get uncomfortable you could let him sleep then take him to his room once his asleep (provided he's not too heavy).

Relevant article https://web.archive.org/web/20250314201213/https://www.ft.com/content/a8016c64-63b7-458b-a371-e0e1c54a13fc

Admittedly the downward trend began sometime in the 2012s so it predates LLMs.