Originally Posted by
teemuflyer
You'll have access when you arrive to LAX since your next flight is before 6:AM the next day. However, as noted, it will close for several hours after the last QF flight departs after midnight so you can't take a nap in there during the closed hours.
The AA Flagship Lounge is open until 1:30am or therabouts, so that provides an option after the QF lounge closes--but then you'll have a three hour gap until it reopens at 4:30am. There is nowhere comfortable to be in that interim period. Given your 12 hour layover I would strongly recommend an airport hotel. If you stay at the Hyatt or near there you can walk to Sam First for the evening, which is an excellent jazz club. Then, get some sleep and go back to the terminal when stuff reopens...