What's available at Suvarnabhumi and Don Mueang before your flight — lounges, sleep pods, showers.
ROH (Royal Orchid Lounge) for Thai Airways business class; Miracle and Coral Executive Lounges available by day pass (1,000–1,500 THB); Priority Pass widely accepted.
Smaller lounges for AirAsia passengers; less comprehensive than Suvarnabhumi; Miracle Lounge accepts day passes.
Napman and Snooze at Suvarnabhumi — sleep pods for a few hours during long layovers; book in advance; 500–1,000 THB for 2–4 hours.
Suvarnabhumi departures level has excellent food options, massage chairs, and a 7-Eleven; international terminal restaurants are open 24 hours.