18 Month Sleep Regression: What It Is and How to Get Through It

Sharing what’s working, what’s not, and how we’re finding our way back to sleep.

I’m writing this in real time—while in the thick of the 18 month sleep regression. Our little one, who had been sleeping beautifully for months, suddenly started waking up at night, fighting bedtime, and rising way too early. It’s been exhausting, confusing, and honestly a little discouraging. But I’ve also learned a lot, and I want to share what’s helping us get through it.

If you’re here, chances are you’re in the same boat. Maybe your toddler was sleeping through the night and now they’re not. Or perhaps bedtime has become a battle. Maybe you’re wondering what happened and how to fix it. This post is for you.

What Is the 18 Month Sleep Regression?

A sleep regression is a sudden, temporary disruption in your child’s usual sleep patterns. It often shows up as:

• Trouble falling asleep
• Frequent night wakings
• Early morning wake-ups
• Shorter naps or nap refusal

The 18 month sleep regression is especially common because it coincides with major developmental changes. Your toddler is learning new skills, asserting independence, and becoming more aware of their surroundings—all of which can make sleep feel less secure.

Common Causes of the 18 Month Sleep Regression

There’s no single cause, but here are the most common triggers:

• Developmental milestones
• Separation anxiety
• Changes in routine
• Teething
• Illness
• Daylight savings or seasonal changes

Sometimes it’s a combination of these. For us, it was a mix of travel, daylight savings, and a burst of new skills. Suddenly, our perfect little sleeper wasn’t sleeping at all.

How to Handle the 18 Month Sleep Regression

First, take a deep breath. This is temporary. It’s frustrating, but it’s also normal. Here’s what’s helping us—and what might help you too.

Re-establish a Consistent Bedtime Routine

Toddlers thrive on predictability. If your routine has slipped, bring it back. For us, that means:

• Dinner by 5:30
• Bath around 6:15
• Pajamas, books, and cuddles
• Lights out between 6:45 and 7:15

Even if your child resists bedtime, sticking to the routine helps signal that sleep is coming.

Create a Calm Sleep Environment

Dim lights, soft voices, and a quiet room can help your toddler wind down. We use blackout curtains and a white noise machine to block out distractions. Avoid screens for at least an hour before bed—they can interfere with melatonin production.

Offer Reassurance Without Restarting Old Habits

If your child is struggling with separation anxiety, sit nearby and offer comfort. But try not to pick them up or rock them to sleep unless absolutely necessary. These habits can quickly become patterns that are hard to break.

Instead, build confidence slowly:

• Sit beside the crib or bed
• Offer verbal reassurance
• Gradually move further away over several nights
• Eventually return to leaving the room after saying goodnight

Watch the Clock and Give Space to Self-Soothe

It’s easy to rush in at the first cry, but toddlers need space to learn how to settle themselves. I remind myself to check the clock. What feels like 10 minutes is often just 2. Give them 5–10 minutes before intervening, unless they’re truly distressed.

Track Sleep Patterns and Adjust as Needed

Some toddlers start needing less daytime sleep around 18 months. If naps are long or late, they may interfere with bedtime. Try:

• Capping naps at 1.5–2 hours
• Keeping nap time consistent
• Avoiding naps after 3:00 p.m.

If your toddler is waking too early, consider shifting bedtime slightly later—but only by 15 minutes at a time.

Be Patient and Persistent

Sleep regressions can last days or weeks. Progress may be slow. Celebrate small wins—like one fewer wake-up or a smoother bedtime—and keep going. Your consistency will pay off.

Things That Might Be Making It Worse

Sometimes we unintentionally reinforce the regression. Here are a few habits to watch for:

• Screen time before bed
• Late dinners
• Rushed routines
• Inconsistent bedtimes

We’ve found that keeping bedtime within a 30-minute window—between 6:45 and 7:15—helps our toddler feel secure. Even during daylight savings, we stuck to the same time and slowly adjusted.

Can You Prevent the 18 Month Sleep Regression?

Not really. You can minimize disruptions, but regressions are often tied to growth and development. And that’s a good thing. Sleep falling apart usually means something amazing is happening—your child is learning, growing, and becoming more independent.

We love to travel, and we accept that sleep might be rough for a few days. That’s okay. We build in recovery time, stick to our routine, and trust that things will settle down.

When to Seek Help

If the regression lasts more than 4–6 weeks, or if your child seems unusually anxious or overtired, talk to your pediatrician. They can rule out medical issues and offer guidance. Sleep consultants can also help if you’re feeling stuck.

Frequently Asked Questions About the 18 Month Sleep Regression

How long does the 18 month sleep regression last? Most regressions last 2–6 weeks. Consistency and routine can help shorten the duration.

Should I sleep train again? If your child was previously sleep trained, revisit those techniques. You may not need to start from scratch—just reinforce the habits that worked before.

Is it okay to comfort my child during the regression? Yes—but try to offer comfort without creating new sleep associations. Reassure them while encouraging independent sleep.

Can teething cause sleep regression? Absolutely. Molars often come in around 18 months and can cause discomfort. Talk to your pediatrician about safe pain relief options.

Will naps be affected too? Sometimes. Your toddler may resist naps or shorten them. Stick to a consistent nap schedule and offer quiet time even if they don’t sleep.

Final Thoughts

The 18 month sleep regression is tough—but it’s also temporary. Your toddler is growing, changing, and learning how to navigate the world. Sleep disruptions are part of that process.

You’re not doing anything wrong. You’re not alone. And you will sleep again.

Stick to your routine. Offer comfort. Give space. Be patient. And remember—this phase is just one part of the journey. The wave of “goodnight” before you walk out of the room will return. And when it does, you’ll appreciate it even more.