So I know all babies are different and all... But I have been reading all this fire and brimstone about the 4 month sleep regression and how terrible it is. Wondering if it is consistently horrific or has varying degrees of difficulty? How long did it take your kid to make it through? I have 15wo twins and I think they are starting to transition to some REM sleep. They've been waking up at night when they didn't used to and naps are becoming a struggle again. But it's not terrible. Wondering if I can plan on it getting far worse! Ha!