Your toddler knows exactly what they want, and right now it isn’t sleep. Around 18 months, many children who slept well start fighting bedtime, waking at night and refusing naps. The 18 month sleep regression is one of the toughest because toddlers have opinions, and the words (and lungs) to express them. The good news is that it’s temporary and very manageable. This guide is part of our baby sleep guide by age.
If your toddler is still in a crib, check it against our safe sleep checklist: mattress at its lowest setting, and nothing in or near the crib they could use to climb out.
What causes the 18 month sleep regression?
Four toddler drivers tend to collide around this age:
| Driver | What’s happening | How it affects sleep |
|---|---|---|
| Independence | Toddlers start moving away from you while checking you’re still close (CDC) | “No!” at bedtime, stalling, protests when you leave |
| Language burst | Most try to say three or more words besides “mama” or “dada” by 18 months (CDC) | A busy brain, chatting or calling out at night |
| Teething molars | The big back teeth often arrive in the toddler years (AAP) | Discomfort and night wakings |
| Nap transition | Many children move to one nap between 18 and 24 months (Cleveland Clinic) | Overtired evenings or too little sleep pressure at bedtime |
There may also be separation anxiety lingering from infancy, which the AAP says usually fades around the second birthday.
Signs of the 18 month sleep regression
- Refusing to go to bed, or crying the moment you leave
- Waking at night and calling for you, after months of sleeping through
- Early waking
- Short or skipped naps, or a toddler who protests one nap and melts down by dinner
- Wanting “one more” book, drink or hug, every night
If your toddler has a fever, pulls at their ears, snores loudly or seems unwell, check in with your pediatrician; illness can look a lot like a regression.
How long does the 18 month regression last?
There’s little research on toddler regressions specifically, but Cleveland Clinic pediatricians say infant sleep regressions typically last a week or two, and toddler phases often settle on a similar timeline. If molars or the switch to one nap are part of the picture, it can take a few weeks to settle fully. What makes the biggest difference is consistency: the faster bedtime feels predictable again, the faster the phase passes.
Should I drop the nap?
Probably not yet, and certainly not altogether. Cleveland Clinic notes that children may transition to one nap daily between 18 and 24 months, and that nearly all children still take at least one nap at age 3.
Signs your toddler is ready for one nap:
- They consistently refuse the second nap for a week or two, not just once or twice.
- They take a long time to fall asleep at bedtime after two naps.
- They cope well until a midday nap.
How to switch: gradually push the morning nap later until it lands around midday, and move bedtime a little earlier for a while to cover the gap. A quiet rest in a dim room still counts on days the nap doesn’t happen.
The 12 month nap-refusal myth
Many babies refuse a nap around their first birthday, and parents assume it’s time to drop to one. Often it’s a short phase linked to standing and cruising. Keep offering two naps for a couple of weeks first. Most children aren’t ready for one nap until later. Our 12 month sleep regression guide explains how to tell a phase from real readiness.
Gentle fixes that work at 18 months
Offer limited choices
Toddlers fight bedtime partly to feel in control. Give that control where it doesn’t matter: “Do you want the moon pajamas or the star ones?” “Which book: the bear or the bus?” Two choices, both fine with you. The bedtime itself isn’t up for discussion.
Keep the routine identical
The AAP recommends a quiet bedtime routine at the same time every night, and suggests taking care of drinks, a light or the door left ajar before bedtime so they can’t become reasons to call you back. A routine like bath, pajamas, brush teeth, one book, affirmation, sound on, lights out works well. Our toddler bedtime routine has a full step-by-step and a printable chart.
Keep night responses short and calm
The AAP suggests avoiding going back in every time your toddler calls out, because they’ll learn to expect you each time. If you do need to check (they sound scared, sick or hurt), keep it brief, with the same reassuring words: “You’re safe. It’s sleep time. I’ll see you in the morning.” Long chats, lights on or bringing them to your bed can teach them that calling out is worth it, and the AAP specifically advises against letting toddlers sleep in your bed as a fix for bedtime trouble.
Let a comfort object help
At this age it’s fine for your toddler to sleep with a teddy bear, special blanket or favorite toy, according to the AAP, as long as it has no choking hazards like buttons or loose parts, and it can help them settle when they wake in the night. (In the first 12 months, keep the crib empty.)
Use a sound cue and a short affirmation
A familiar sound at the same point in the routine signals that sleep is coming. Keep it around 50 dB or lower, about the level of a quiet conversation, with the device about 2 m (7 ft) from the crib; read how loud white noise should be. Pair it with one short affirmation you say together every night, like “I am brave” or “I am safe and loved.” Our list of affirmations for toddlers has dozens of three-to-six-word ideas.
Real previews from the app. Play them softly.
In the Baby Mantra app, the Little Brave Heart playlist layers gentle, confidence-building affirmations over soft sounds, and the sleep timer fades everything out after 15 minutes to 2 hours.
What comes next?
Many families get a calmer stretch after 18 months, then meet another bumpy phase around the second birthday, when fears, big life changes and boundary testing take center stage. Read our 2 year sleep regression guide to get ahead of it.
Sources
- CDC. Important Milestones: Your Child By Eighteen Months.
- Cleveland Clinic. 4 Signs Your Child Is Ready To Stop Napping.
- Cleveland Clinic. Infant Sleep Regression: What Parents Need To Know.
- HealthyChildren.org (AAP). Toddler Bedtime Trouble: 7 Tips for Parents.
- HealthyChildren.org (AAP). Separation Anxiety and Sleeping.
- HealthyChildren.org (AAP). Teething & Tooth Care.
