Just when parents think they've finally cracked sleep, the 18-month regression arrives. Night wakings return, naps become battles, and early morning wake-ups become the new normal. This is not a parenting failure — it's a developmental milestone.
At 18 months, toddlers are experiencing a surge of independence alongside a parallel surge of separation anxiety. They now understand that you exist when you're not in the room — and that awareness makes them want you closer. This cognitive leap disrupts sleep.
Molars often emerge around this time, adding physical discomfort to the neurological upheaval. The combination is potent.
Maintain your routine as consistently as possible. Consistent sleep cues — the same order of bath, pyjamas, book, song — signal the brain that sleep is coming. Disrupting these cues in response to the regression often prolongs it.
Respond to night wakings calmly and consistently. Brief comfort reassures without creating new sleep associations that will need to be undone later. The goal is gradual, supported independence — not extinction, but also not full re-involvement in the child's sleep process.
The 18-month regression typically lasts 2 to 6 weeks. Knowing it's temporary helps. Consistency is your most powerful tool for shortening it.