SUMAQ lounge is open 24/7, place can be a zoo during the rush hours between 2300-0200 when all the flights to/from North America sort out all the pax between planes. Sumaq is ok with a not to bad snack/sandwich layout. I've used the showers and sleeping room before, just ask the desk and they'll set you up. There's a some shopping and a couple of ok places to eat in the transit area. Hope this helps.

TTuna