No personal experience, but I seem to remember there is nowhere to go at 4AM. Hopefully someone else can clarify, but I thought they allowed folks in at 10PM night before and then closed up at some point (midnight?) and did not re-open the building until 5AM. Getting there at 5AM (or earlier) is not a bad idea. I cannot remember about WiFi. I am old school and bring a book to read for when all else fails.
For you any anyone else planning long waits, if they use the same waiting area downstairs, it is on concrete. Not the most comfortable place to wait for hours and hours but at least inside. I bought these to sit on:
https://www.amazon.com/dp/B01A9GQ4NQ/_encoding=UTF8?coliid=I3KX9MON0AM9JC&colid=31UKTQN1WSLQZ
Most everyone guts it out on the concrete using sweatshirts.hoodies to soften the ground. Some folks bring fold-up chairs then abandon them because they cannot bring them into the Hall because they are too big. Some folks bring these types of fold-ups like I just bought that fit into a backpack and you can keep these.