Snakes LOVE to play hide 'n seek, & they're better than we are at it. Be careful that you don't move things in a way that could hurt him if he's underneath...
I've heard of snakes slithering between a mattress & box-springs, and they seem magnetically drawn to couch cushions, so check before you sit down.
He's probably in the same room, so if you can close it off so he can't get under the door, etc, that should help you. Think like a snake, & you'll find him.![]()