We've been struggling with our LO, she has been up many nights screaming for hours on end. I guess she has colic? Not really sure, but the other night she was up for nearly 6 hours crying!!! We just watched a movie called The Happiest Baby on the Block, it's about how to calm a crying baby.  We are very excited to try these techniques, they seemed to really work in the movie. Just wanted to pass this along to anyone else who is struggling at night like we are. Hope it helps!