Hi there, my LO is 7.5 weeks old, and was also able to go from a 10:45pm DF until 5:30am-ish, but the last two nights has been waking up at 3:20am and 2:30am and taking generally a full feed. I've been looking back at TBWSAYP and it seems like all of our LOs could possibly be going through growth spurts. I've been keeping her on a 3-hour EASY despite the last two nights...if she wakes up again tonight, I'll probably go to a 2.5 hour EASY for a few days and see if that changes things (TBWSAYP, top of p. 118; other pgs. re. growth spurts: 30, 115-119, 197-199) . If your LOs are waking every 2-3 hours at night, that sounds like a feeding schedule. Perhaps you could take your EASY down a half hour (if you're 3.5 hours, go down to 3, etc.)? Maybe that will help your breasts to produce more milk. My LO seems full after one breast, but I'm trying to get her to eat from the other to get more calories in. Not successful at the moment, but we'll see.
Hope you find a solution soon!
Heidi