Have reservation for today at 4 points Sheraton but we came at 11am and no dice we couldn't check in early... Any ideas or that's that?
it's always a YMMV. It's also a plat benefit to have early check-in and up to 4:00pm check out. Almost makes one night worth two nights in that case.
In your situation, they will give you an area, but if it's really needed, then a friend can book you a room on plat and request early check in. (They can even ask in advance and it may be available...)