sleeping through the night?!

As
Please help me figure out how to get my almost 5 month old to sleep at night! She goes down very easy around 8pm after a 7oz bottle (exclusively BF). She lays there quietly with her eyes open then falls asleep without a hassle. She's usually good for the first 3-4 hours, then all hell breaks loose... She wakes screaming every 1-3 hours after that. She sleeps in that Merlin's Magic Suit, but I think she still startles herself awake and needs the pacifier to fall back asleep every time. I don't even think she is hungry at all. If we stick her paci in she goes back to sleep immediately, but no amount of patting/rocking her would do it. We try to let her cry for a little while before we give her the paci but that doesn't seem to be making anything better... what else can we do?