Does BKK require a same day boarding pass for entry?

Context. It is my intention to leave my heavy bag at one of BKK's luggage storage facilities the night before I leave for 4 day journey Bhutan. So, I'd arrive at BKK from Bangkok, store my bag, and then go to the airport hotel for the night. (My flight is at 0600 - so must maximize sleep of course.)

TIA!