We will have about 7 hrs. at Narita Airport before our flight back to the States, so we are thinking about booking a room at one of the day-hotels at the airport, preferably the one located after passport control in Terminal 1, just so that we will have one fewer thing to contend with. But, we can't remember if passengers are allowed to go through passport control that far in advance at Narita, 7 hours prior to our flight departure. Please help! Thank you.