The 18 Month Sleep Regression: What It Is and What to Do

Bedtime was going well. Then, seemingly overnight, your toddler is protesting at lights-out, calling for you in the night, or wide awake at times they used to sleep through. Many parents call this the 18 month sleep regression. It can feel like a step backwards, but it usually reflects a step forwards: your toddler is growing, learning and becoming more independent, and sleep sometimes wobbles while that happens.

This guide covers what parents tend to notice around this age, why it happens, how separation anxiety fits in, and calm, practical ways to handle bedtime and night waking — including where music helps and where it doesn't.

What parents notice around this age

Every toddler is different, but parents often describe some of these:

• Bedtime protests. Saying "no", crying or trying to climb out when it's time for bed.
• Night waking. Waking and calling out more often, or finding it harder to settle again.
• Clinginess. Wanting you nearby at bedtime, or getting upset when you leave the room.
• Nap resistance. Fighting naps, or naps getting shorter.
• Early mornings. Waking earlier than usual and wanting to start the day.

You might see one of these, several, or something different. None of them mean you've done anything wrong.

Why it happens (big steps, independence, separation)

Around this age, a lot is changing at once:

• Big developmental steps. Walking with more confidence, new words, understanding much more than they can say. All of that is exciting, and it can make winding down harder.
• Independence. Toddlers are discovering that they have opinions — and that "no" is a powerful word. Bedtime is a natural place to test it.
• Separation. HealthyChildren.org, from the American Academy of Pediatrics, notes that while many babies show separation anxiety earlier, many toddlers start to show it in the toddler months (HealthyChildren.org, How to Ease Your Child's Separation Anxiety). Bedtime is a separation too, so it can bring those feelings up.
• Teething and illness. Back teeth, colds and other ordinary toddler things can disturb sleep for a while. If you're unsure, check with your doctor.

Seen this way, the 18 month sleep regression is often less about sleep itself and more about everything else your toddler is working through.

Keep the routine steady

When sleep feels unpredictable, a steady routine gives your toddler something that stays the same. Research on bedtime routines found that families who followed a simple, consistent nightly routine reported fewer problematic sleep behaviors in their infants and toddlers (Mindell et al., 2009).

18 month sleep regression, what to do first? Keep the basics:

• Same order every night: bath, pajamas, milk, teeth, story, music, lights out.
• A calm pace. Leave enough time so bedtime doesn't feel rushed.
• Offer small choices. "This pyjama top or that one?" "Which book?" Little choices can help a toddler who wants independence, without changing the routine.
• A short goodbye ritual. HealthyChildren.org suggests quick, consistent goodbye rituals for separation; the same idea works at bedtime: the same words, a hug, and a calm exit.
• Avoid big changes for now. If you can, wait with things like moving to a big bed until things feel calmer.

A routine chart can help too — your toddler can see what's next and point to it. See the toddler bedtime routine hub for the whole evening, step by step.

Night wakings: a calm, boring response

Night waking during an 18 month sleep regression can be the hardest part for tired parents. The goal is a response that is warm but very predictable — and a little boring.

• Pause briefly before going in, if you feel comfortable, in case your toddler settles on their own.
• Keep the room dark and your voice low.
• Use the same short phrase each time, such as "It's sleep time. I love you. Goodnight."
• Keep it short. Reassure, then leave, the same way every time.
• Avoid starting new habits in the middle of the night that you don't want to keep.

Different families choose different approaches, from staying close to stepping back gradually. The most important part is choosing one you can keep doing calmly. If your toddler often reaches bedtime already overtired, our guide to music for an overtired toddler and the article on why babies fight sleep may help.

Where music helps (and where it doesn't)

Music won't end a regression, and it can't make a toddler sleep. Where it can help is in keeping bedtime sounding the same every night. When the same soft piano piece plays at the same point in the routine, it becomes a familiar signal that the day is ending.

• Helpful: a calm, consistent cue at bedtime; a familiar sound if your toddler wakes and the music is still playing softly; something steady for you, too.
• Not helpful: switching music every night, loud volume, or music with words and catchy tunes that invite your toddler to sing along.

Keep the volume low and the speaker away from the bed. Our guide to music for the 14 month sleep regression covers the stage just before, and music for the 4 month sleep regression is the starting point for our regression guides.

Soft, original piano for the end of the day. Keep the volume low and the device away from the bed.

For a look at every stage from the early months to the toddler years, see our guide to sleep regression ages.

When to ask your doctor

Unsettled sleep is common around this age, but trust your instincts. Talk to your doctor or health visitor if:

• your toddler seems unwell, in pain, or has a fever;
• you notice loud snoring, pauses in breathing or very restless sleep;
• sleep problems carry on, or you're worried about your toddler's development or behavior;
• you are struggling to cope.

Asking for advice is always fine, and you don't need to wait for things to get "bad enough".

Frequently Asked Questions

How long does the 18 month sleep regression last?

There's no fixed length, and every toddler is different. For many families, unsettled sleep eases as their toddler gets used to new skills and feelings. Keeping the routine steady and your nighttime response calm and consistent gives your toddler the best chance to settle back in.

Is it separation anxiety or a regression?

Often it's both. Separation anxiety is common in the toddler months, according to HealthyChildren.org, and bedtime is a separation. If your toddler is especially clingy at drop-offs and bedtime, short, consistent goodbye rituals and a predictable routine can help them feel secure.

Should I change the bedtime routine?

Usually it's better to keep it. A familiar routine is one of the most reassuring things during a regression. You might adjust small details — a little more time to wind down, or offering choices — but keep the order and the cues the same.

How much sleep does a toddler need?

The American Academy of Sleep Medicine's consensus statement recommends that toddlers aged one to two "should sleep 11 to 14 hours per 24 hours (including naps) on a regular basis" (AASM). Every child is different within that range.

Get the free Regression Guide

Want calm, step-by-step help for unsettled phases? Download the free Sleep Regression Guide