18-month sleep regression
Typical age: 17–19 months. Usually lasts: 2–6 weeks.
Why it happens
Toddlers at 18 months want independence, are learning words fast, may be teething molars and often feel separation anxiety again. They also understand they can say no to bedtime.
Signs
- Bedtime protests and stalling
- Night waking crying for you
- Nap refusal (but still needs one)
What helps
- Offer two acceptable choices at bedtime (“this pyjama or that one?”).
- Keep the routine short, predictable and the same every night.
- Molars hurt: ask your pediatrician about pain relief if teething is obvious.
Check the wake windows for this age in the sleep schedule builder.
When to call your pediatrician
Call your pediatrician today
- Fever, ear pulling with a cold, vomiting, or feeding much less
- Loud snoring or pauses in breathing during sleep
- No improvement after 6 weeks
Usually OK to watch at home
- Well and happy by day, feeding and peeing normally
General guidance based on AAP, NHS and CDC advice, not a diagnosis. If your gut says something is wrong, call your pediatrician or nurse line. You never need permission to seek care.
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Questions parents ask
Is my 18-month-old ready to drop the nap?
Almost never. Most toddlers need one nap until at least 2.5–3 years.
Other sleep regressions
- 4-month sleep regression (3–5 months)
- 6-month sleep regression (6 months)
- 8-month sleep regression (8–10 months)
- 12-month sleep regression (11–13 months)
- 2-year sleep regression (2 years)