as long as one has an intention to fly and has a long(%) transit immd is not gonna take you to court for going for a shower and some food after getting off a flight that arrives at 5am (or whenever your flight is).

However, dont expect you can be taken care of quickly if you need to get out before 10am during the morning bank of flights.

No comments for other reasons for using the lounge and back out - do at your own risks.

(%)- assuming you spend min 2 hours in lounge (spare more time for getting out in the morning) after arrivals to shower, eat, and wait for staff to walk you out + returning 1 hours before flight + 1.5 hours for the 2-way airport express trip, you’re looking at killing 6 hours before you can do anything in town. YMMV.