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The 4-month sleep regression isn't a phase — it's a permanent change in how the brain sleeps. Here's exactly what's happening, why it doesn't resolve on its own, and the practical strategies that actually help.

"Sleeping through the night" means 5–6 continuous hours in clinical terms. Most babies reach this by 3–4 months. Here's the honest timeline, the 4-month regression explained, and what the evidence says actually helps.