Alibaby, I could have written that exact same post as well. DS has been getting frustrated for the last week or so and keeps pulling himself off the breast and crying after just a few minutes. I have plenty of milk so I know he's getting something, but I was starting to get worried he wasn't feeding for long.
I always offer the second side, sometimes he will suck for a minute or two and other times he doesn't want any at all. DS's sleeping habits sound the same as your DD's as well. I'm just relieved to know it is normal.