If your baby's sleep suddenly fell apart around 4 months, you've likely hit the 4-month sleep PRO-gression. During the newborn months, babies' sleep cycles aren't well defined, which means they can easily pass from one sleep cycle to the next without fully waking. But at around 4 months babies go through a huge shift in sleep biology. Their sleep cycles are now separated into four phases and there's a distinct line between the end of one sleep cycle and the next. Which means they now start to wa
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8 things that actually help: ⸻ 1. ⏳ fix the last wake window (biggest one) too long awake before bed = overtired = frequent wake-ups most babies need a shorter, calm window before night sleep — 2. 👀 don’t wait for crying at bedtime early cues = staring off, slower movement crying = already overtired → harder night — 3. 🌙 make nights clearly different from day dim lights, quiet voices, no stimulation same cues every night → brain learns “this is sleep time” — 4. 🔁 keep night wake-ups boring no
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Struggling to get your baby to nap longer than a sleep cycle (around 30–45 minutes)? Here’s what’s usually behind it. ▫️Under 4 months: timing is the most common factor If you’re still working with very short wake windows of 45–60 minutes, it’s time to extend them. Babies need enough awake time to build adequate sleep pressure to nap longer. If they’re settled to sleep too early, even when showing tired signs, they wake after one sleep cycle simply because there wasn’t enough pressure to sleep a
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