We got the sleep suits yesterday and tried them out last night. The boys went down at 7:30 after a few minutes without fussing. Andrew woke up once at 12:30 for his pacifier and went right back to sleep, then again at 3:30 to eat. Ryan was still sleeping after 8 hours when we woke him to feed them both at the same time. They needed a little help to get back to sleep after that but then they slept until 7am. They did have their 4 month shots yesterday so I don't know if that had anything to do with it, too, but we'll see how the next few nights play out with the sleep suit. Thank you SO MUCH for suggesting it!
alliapistor, I would definitely recommend trying it out to wean DS from the swaddle.