Experience shows me (albeit domestic red-eye experience, not long haul) that most hotel bars open at 10am, so you always have a post-flight destination!
(although quite embarrasing if you get into sydney at 10am, end up doing a pub crawl through kingsx, end up that afternoon at woolomoolo bay hotel flirting with bar staff, and end up back in hotel lobby at 8pm after a dinner of hungry jacks, to be greeted by crew having their pre-dinner chardy's and you are too smashed to be able to even conduct a conversation with them - err not that I know that from experience or anything
)