The 18-Month Sleep Regression
Updated
Quick answer: The 18-month sleep regression is a period of bedtime battles, nap refusal or night waking that’s common around 18 months. It’s often linked to growing independence, separation anxiety, big language leaps and molars coming in. It usually lasts 2–6 weeks.
Why it happens
- Toddlers want more control and test limits, especially at bedtime.
- Separation anxiety can peak again.
- Molars often come in between 13 and 19 months.
- Fast language development can make busy brains harder to switch off.
What helps
- Offer limited choices before bed (which pajamas, which book) to give a sense of control.
- Keep the routine predictable and short.
- Respond calmly and consistently to protests.
- Keep the nap — refusing it at 18 months rarely means it’s time to drop it.
- Check the nap timing: most 18-month-olds do well with a nap starting around 12:30–1 pm.
Common questions
Should I drop the nap at 18 months?
Almost never. Most children need a nap until at least age 3.
Why does my 18-month-old suddenly fight bedtime?
Testing limits and wanting more control are normal at this age. A consistent routine and calm responses help.