Updated on
11.4.25
One moment, your toddler is sleeping soundly through the night. The next? It’s an all-out bedtime showdown. Suddenly, the crib is lava, naps are a distant memory, and your once-sleepy little one is fighting bedtime like it’s their full-time job.
Maybe they’re waking up at 2 AM, ready to party. Maybe they’re throwing epic tantrums at nap time, refusing to sleep even though they’re clearly exhausted. Or perhaps they’re clinging to you for dear life as if you’ll disappear the moment they close their eyes. Whatever it looks like—it’s exhausting.
You might be wondering: Did we ruin their sleep routine? Are they overtired? Undertired? Teething? Growing? Why is this happening?! Deep breath. This is the 15-month sleep regression. And while it’s frustrating, it’s actually a sign of healthy development (even if it doesn’t feel that way at 3 AM)
If your toddler is suddenly resisting sleep, waking more often, or skipping naps, you’re not alone. The 15-month sleep regression is a common sleep disruption caused by developmental leaps, growing independence, and shifting sleep needs. In this guide, we’ll cover:
Yes, the 15-month sleep regression is real, though not every toddler experiences it. Around this age, little ones go through big developmental leaps—they master new skills, become more independent, and even assert their opinions (sometimes loudly!). All of this can disrupt their sleep, even if they were previously great sleepers.
While not every toddler will struggle, if your once-predictable sleeper is suddenly fighting naps, waking frequently, or getting extra comforting, you’re likely dealing with a classic sleep regression. The good news? It’s a temporary phase—and with a few adjustments, you can help your child settle back into a healthy sleep routine.
You get through the bedtime routine—bath, book, snuggles, lights out. You breathe a sigh of relief, thinking you’re in the clear. Then, just as you settle in for some much-needed downtime… BAM. Your toddler is suddenly wide awake, calling for you, and acting like bedtime was merely a suggestion.
Their sleep patterns are shifting at this stage, and they’re learning new tricks—literally. Whether it’s standing in the crib when they should be sleeping, refusing naps altogether, or clinging to you like a human koala, sleep resistance has become their new favorite game.
If your toddler’s once-reliable sleep routine suddenly falls apart, these signs point to the 15-month sleep regression. But it’s temporary—just a phase, not a forever thing.
Sleep regression and its impact on night time sleep and nap time
Understanding the signs can make all the difference. If you're ready for more tailored support in managing your toddler’s sleep needs, check out how Happy Baby can help you create personalized sleep schedules and strategies, making bedtime a little easier for everyone. Try the app now!
At this age, toddlers are on a mission— mastering new words, climbing onto furniture they definitely shouldn’t, and testing every boundary in sight (including bedtime rules). But all this newfound independence and growth? It comes at a cost—their sleep.
The 15-month sleep regression isn’t random; it’s driven by big developmental leaps, changing sleep needs, and, of course, teething (because why not add more chaos?). If your toddler suddenly refuses naps, wakes up at night like it’s a slumber party, or holds on to you at bedtime like you’re their favorite stuffed animal, here’s what’s likely causing it:
Your toddler has officially entered the "I do it myself" phase. Whether it’s putting on shoes (backward), refusing help with snacks, or insisting on climbing everything in sight, they realize they have control over their world. And what’s one of the first things they’ll test? Bedtime. The more independent they feel, the more they may resist being tucked in.
Remember when you could leave the room without a dramatic meltdown? At 15 months, that’s a distant memory. Separation anxiety is hitting a new high, making bedtime a full-on cling-fest. They’re suddenly hyper-aware that you exist even when you’re not in sight and that realization? It makes saying goodnight a whole lot harder.
Who has time to sleep when you’ve just learned to run at full toddler speed? Gross motor skills are booming at this stage, and for many little ones, that means using every opportunity to practice—even at bedtime. You might find them standing in the crib, rolling around restlessly, or even attempting a great escape.
Your toddler’s vocabulary is expanding daily, and all that brain activity means sleep can take a hit. If they’re calling out for you in the middle of the night or practicing new words instead of snoozing, it’s because their little mind is in overdrive—trying to process and retain every new word, sound, and phrase.
As if sleep regressions weren’t enough, molars are making their grand entrance. These aren’t just any teeth—they’re the big ones, the ones that make gums sore and sleep extra tricky. If your toddler is chewing on everything, drooling more than usual, or waking up fussy, teething might be part of the problem.
Around this age, many toddlers drop from two naps to one. The tricky part? The adjustment doesn’t happen overnight. Some days, they might still need two naps; on others, one is plenty. This inconsistency can lead to overtiredness, bedtime battles, and middle-of-the-night wake-ups.
At 15 months, your toddler is starting to push boundaries and see what they can get away with. Whether it’s stalling bedtime, refusing naps, or demanding extra cuddles, they’re testing their newfound independence. And, let’s be real—they know exactly how to make you cave.
Sleep regressions happen because your toddler’s brain is leveling up—adjusting to a more grown-up sleep cycle that supports all the incredible mental and physical growth happening right now. Their body is learning to sync with a more mature circadian rhythm [2], but like any big change, it comes with a few bumps along the way (a.k.a. those sudden night wakings and nap battles).
But before you start bracing for sleepless nights indefinitely, there’s light at the end of the tunnel. With a few adjustments, you can help your little one navigate this phase and get their sleep back on track.
While there are many factors behind the 15-month sleep regression, Happy Baby offers expert-backed tools to guide you through each stage. Discover how we can help identify your toddler's unique needs and bring some peaceful nights back to your family. Download the app now!
The 15-month sleep regression typically lasts two to six weeks, although it varies for each toddler. Some little ones bounce back in a few days, while others take longer—especially if teething, separation anxiety or a nap transition is at play.
If your toddler is adjusting to dropping a nap, their sleep might be rocky until their body adapts. If it’s separation anxiety, they may need extra reassurance at bedtime. And if teething is the culprit? Things should settle once those molars finally push through.
What is the best way to keep this phase from dragging on? Stick to consistent routines, encourage independent sleep skills, and adjust wake windows as needed. Up next—what you can do to help your little one get back on track.
The 15-month sleep regression can throw a real curveball at you and your little one, leaving you wondering how to get back to those peaceful, uninterrupted nights. But no need to worry—there are actionable strategies you can implement right away to help guide your toddler back to better sleep. Let’s dive in!
A bedtime routine offers the stability and security your toddler needs during this phase. Consistency is key in helping your child wind down and prepare for sleep.
If your toddler struggles to settle down, it might be time to adjust their bedtime based on their evolving sleep needs.
The 15-month sleep regression often overlaps with the transition from two naps to one. If your toddler is resisting naps or waking early, this could be a sign that it’s time to drop a nap.
Setting up the right environment for sleep is one of the easiest ways to help your toddler settle down, especially if they’re struggling with the 15-month regression.
Light exposure can significantly impact your toddler’s circadian rhythm. Managing how and when your child is exposed to light can help improve their sleep patterns.
Teething can be one of the more painful causes of sleep disruption at this age. Helping your toddler manage teething pain can help them get the rest they need.
This regression will pass, but it can be frustrating to see your toddler struggling with sleep. Stay patient and responsive to their needs during this time.
Managing the 15-month sleep regression might feel like a marathon, but remember that you’re not alone in this. With a bit of patience, consistency, and the right tools, you and your toddler will be back to sweet sleep in no time.
Are you ready to get your toddler’s sleep back on track? With Happy Baby, you can get personalized sleep schedules, tips, and expert guidance tailored to your toddler’s needs. Let us help you navigate this sleep regression with ease!
When your toddler’s sleep pattern is all over the place, it can feel like you’re stumbling through a foggy, sleep-deprived maze. However, while the 15-month sleep regression is generally a temporary phase, there are times when it’s worth reaching out for some professional guidance.
If your little one’s sleep struggles continue for weeks despite trying everything under the sun, or if you’re noticing other health issues, it’s time to consult your pediatrician. Here’s when you should pick up the phone:
Remember, sleep regressions are part of the developmental journey, and your child will eventually return to normal sleep patterns. However, when in doubt, it’s always best to seek professional support to rule out any other concerns.
Take a deep breath—you’re doing great, and this phase won’t last forever!
The 15-month sleep regression can feel like a never-ending uphill battle, but remember—it’s just a phase. With a little patience, consistency, and understanding, this sleep challenge will soon be behind you.
Every toddler is different, but by staying calm, sticking to routines, and offering reassurance, you’re helping your little one navigate this developmental stage. You’ve got this!
Are you looking for more support with your toddler’s sleep? Happy Baby is here to help you create personalized sleep schedules and routines that fit your child’s needs. Get expert guidance, tips, and strategies to turn those sleepless nights into restful ones—because every parent deserves a good night’s sleep too.
1. https://www.medicalnewstoday.com/articles/sleep-regression-stages#definition
2. https://www.news-medical.net/health/What-is-Sleep-Regression.aspx
4. https://www.sleepfoundation.org/baby-sleep/sleep-training
5. https://www.webmd.com/baby/what-is-the-right-room-temperature-for-a-baby
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC3047226/
7.https://www.fda.gov/consumers/consumer-updates/safely-soothing-teething-pain-infants-and-children
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