A few days before my LO turned 18 months his sleep suddenly became awful. He was consistently sleeping 11-12 hours a night, but now wakes up for 3-5 hours in the night, can’t soothe himself back to sleep. We have tried melatonin, later bedtime, cut his nap from 3 hours to 1 hour, and nothing helps. Occasionally he will still sleep through but at least 4 times a week is up for hours and hours. It’s now been over 6 weeks. I’m so tired 😅 and stressing as we have a new baby due in 2 months. Any tips/success stories of sleep miraculously reverting back?