If I remember correctly, there is a lounge on the 2nd floor of the airport where you can pay about $39 (or was it $59?) for a pass. It included a free shower, food buffet, comfy chairs, wifi, etc. After I was traveling about the same 30hrs, a shower was like heaven! Showers were extremely clean and refreshing. Bring a change of clothes. Food wasn't too bad either. Unfortunately I don't remember the name of the lounge, but it is the only one that you didn't have to pay a membership to use. If you do it, you won't regret it.