I'm new to the whole club level thing, so I've been doing research, and I did find a source that said: "Stone Harbor Club Lounge itself is open 24 hours and staffed from 7:00 a.m. through 10:00 p.m." But that seems to be from a review from more than 5 years ago, so I thought I'd better check here for more up-to-date info.
So thanks to everyone for the quick responses -- I really appreciate it!
We were planning to focus on EPCOT, so that's why I'm really only looking at BWI, BC, and YC. I think we might still be on board with CL

-- I was thinking about booking a "Deluxe View - Club Level" at BWI so hopefully there's enough room so that DH's staying up late doesn't disturb the sleeping family members.
Does the BWI CL have any water source? Filtered water dispenser, bottled water, etc? I'm picky about water taste, so we usually buy a case of bottled water on our way in, and I'm just wondering if we would still need to do that.