Okay so ive never had any interest in doing this but my bed was raised pretty high last year (enough for me to sit under it and im average height). I just used it as storage for my clothes and stuff but when my boyfriend came to help me move stuff he said he would’ve gone under there all the time to game or watch TV. As long as he isnt like disturbing the peace or doing anything bad id say just leave him. It’s not something i would do but maybe it’s more common than we think? Lol
Maybe he’s just more comfortable there? Honestly im not sure, maybe it’s even (on a sadder note, i know im assuming but maybe it’s something to consider) just something he’s used to? The headphones thing would bother me though- id ask him to just be mindful of that if it keeps happening/bothering you! Best of luck