My LO will be 4 months old on Wednesday so I'm starting to grow wary of the dreaded regression. She had a horrible night on Friday night when she was wide awake from 2:45-6:00 am, which has never come close to happening before, so we got a little spooked. Saturday night and last night were both back to normal, though (sleeping roughly 7pm-7am with several wakeup/dream feeds, always goes right back to sleep immediately after feeding).

So I'm curious what to watch out for. What changes happened to your LO's sleep when the regression hit?

Poll for fun, but mostly I'd love comments. (Enabling multiple votes for multiple LOs).