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Article: Ultimate Guide To 15 Month Sleep Regression

Ultimate Guide To 15 Month Sleep Regression
Sleep Regression

Ultimate Guide To 15 Month Sleep Regression

There is a particularly challenging stage in parenting can be encountered, the 15-month-old sleep regression period. This period often catches parents off guard and can disrupt their little one's once peaceful sleep.

The characteristics of the 15-month-old sleep regression include frequent night wakings, irritability, and difficulty settling. It's no wonder that many parents will try to get some comfort and guidance. Understanding the underlying causes and learning strategies can be invaluable during this difficult time.

In this comprehensive guide, we delve into the complexities of sleep regression in 15-month-old babies, offering insight and support for parents going through this developmental milestone. Let’s get started!

What is the sleep regression?

Sleep regression is a temporary disruption in the typical sleep patterns of an infant or toddler. During these stages, previously established sleep routines may be disrupted, resulting in difficulty falling asleep, difficulty staying asleep, or both.

These regressions often coincide with developmental milestones (such as learning to crawl, walk, or talk), changes in sleep habits, or external factors such as teething or illness. While sleep regressions can be frustrating for both parents and toddlers, they are considered a normal part of a toddler's development and usually resolve on their own with time and patience.

Signs Of The 15 Month Sleep Regression

Sleep regression in parenting can often feel like an unexpected storm in an otherwise smooth-sailing journey. Sleep regression in 15-month-olds is one of those storms, and it can be confusing and exhausting for parents as they navigate through chaotic nights and tiring days. Knowing the signs of this phenomenon can help parents weather the storm more easily.

Increased Nighttime Awakenings: 

One sign that your 15-month-old is losing sleep quality is a sudden increase in nighttime awakenings. Your baby, who used to be a sound sleeper, may now be waking more frequently and needing extra soothing and attention to fall back to sleep.

Difficulty Settling At Bedtime: 

What was once a peaceful bedtime routine may now become a battleground of resistance. A toddler with a 15-month sleep regression may protest more vigorously against bedtime, resisting sleep.

Shorten Naps: 

Daytime naps can also fall victim to regression. Parents may notice that their toddler's naps have gotten shorter, which challenges the rest of the day.

Frequent Fussiness or Irritability: 

Decreased sleep quality in 15-month-olds often brings an increase in irritability. Your little one may be more prone to frustration or meltdowns while awake, which is a sign that their sleep patterns are disrupted.

Resistance to Established Routines: 

Whether it's mealtime, playtime, or bedtime, established routines may be suddenly resisted. toddlers in the 15-month sleep regression period may resist the structure and predictability with which they were once comfortable.

Appetite Changes: 

Some toddlers may experience fluctuations in appetite during regression. They may become less interested in food or become more picky in their eating habits, which may be an additional concern for parents.

Increased Clinginess: 

As sleep becomes more restless, toddlers may seek more comfort and reassurance from their caregivers. Parents may notice their toddler becoming more clingy or needy, craving the closeness and security that only they can provide.

While the signs may seem daunting, it's important to remember that 15-month-old sleep regression is a normal developmental stage, which will eventually pass. With patience, perseverance, and plenty of caffeine, parents can make it through this challenging time and keep their sanity. So if you find yourself deep in the throes of midnight cuddles and bedtime arguments, rest assured that you are not alone and that everything will pass.

Causes Of The 15 Month Sleep Regression

Parents need to understand the reasons behind sleep regression in 15-month-olds, which can give them insight and comfort during this challenging stage of their toddler's development.

Brain Development:

At about 15 months of age, toddlers experience significant cognitive and neurological development. Their brains rapidly absorb new information, process language, and refine motor skills. This surge in brain activity may lead to an increase in nighttime awakenings because even during sleep, their brains are constantly buzzing with new knowledge.


Teething troubles often arise when your toddler is 15 months old. The appearance of new teeth can cause discomfort and pain and disrupt your toddler's sleep patterns. The discomfort of teething may cause your toddler to wake up more often during the night and have trouble falling asleep.

Separation Anxiety:

At about 15 months of age, many toddlers experience strong feelings of separation anxiety. They become more aware of their surroundings and become anxious or distressed when separated from their primary caregiver, especially at bedtime. This fear of separation can manifest itself in increased clinginess, resistance to sleep, and more nighttime awakenings.

Separation Anxiety

Changes in Routine:

As young toddlers grow and develop, their routines may shift and change. Whether it's transitioning from two naps to one, starting daycare, or having their routine disrupted, any deviation from routine can affect their sleep. Changes in routine can lead to confusion and restlessness, making it more difficult for toddlers to fall into a restful sleep.

Physical Developmental Milestones:

Around 15 months, toddlers may be on the verge of mastering new physical developmental milestones, such as walking or climbing. The excitement and energy associated with these new skills may interfere with their nighttime routine, making it difficult for them to relax before bedtime.

Environmental Factors:

Environmental factors, such as changes in the sleep environment, temperature, or noise level, can also cause sleep regression in a 15-month-old toddler. Even seemingly small changes, such as a new crib or a noisy neighbor, can disrupt your toddler's sleep patterns and cause nighttime awakenings.

Sleep regression at 15 months of age can be a daunting obstacle for both parents and toddlers, but understanding the underlying causes can help alleviate anxiety and frustration. By addressing the underlying causes and implementing strategies to support healthy sleep habits, parents can patiently and compassionately help their toddlers through this challenging stage. 

How long does a 15-month sleep regression last? 

The duration of sleep regression in 15-month-old toddlers varies from person to person. Some toddlers's sleep regression may last only a few weeks, while others may last for months.

On average, a 15-month-old's sleep regression lasts between 2 and 6 weeks. Some toddlers may need sleep training, which takes longer. But rest assured, the 15-month sleep regression is a temporary phase that will eventually pass with time and patience.

What to do when your babies are in 15-month regression?

During your 15-month-old's sleep regression, you may feel like you're trying to find your way in a dark room without a flashlight. But fear not, weary parents, because there are strategies you can adopt to help ease your toddler through this challenging phase.

Stick to a Consistent Routine: 

Maintaining a routine is key during the 15-month sleep regression. Stick to a consistent bedtime routine that includes activities like bath time, storytime, and cuddling to help signal to your toddler that it's time to relax and get ready for bed.

Create a Calming Sleep Environment:

Make sure your toddler's sleep environment is conducive to restful sleep. Keep the room dim, quiet, and at a comfortable temperature, and consider using white noise or soft music to mask any distracting sounds.

Offer Comfort and Reassurance: 

During infancy, your toddler may need extra comfort and reassurance to help them sleep peacefully after waking up during the night. Give them soothing words, gentle touches, and cuddles to help them feel secure and safe.

Implement Positive Sleep Associations:

Encourage positive sleep associations in your toddler by providing comfort items such as a favorite blanket or stuffed animal. These familiar items can provide your toddler with a sense of comfort and security, making them feel more at ease during a sleep regression.

Be Patient and Understanding:

Above all, be patient and understanding with yourself and your baby during their 15-month sleep regression. Remember that this phase is only temporary and with time and patience, your little one's sleep patterns will eventually return to normal.

Get a Sleep Sack:

Suitable sleep sacks do help babies sleep better. Sleep sacks provide a safe and cozy environment for babies to sleep without the need for loose blankets to keep them warm, which can pose a suffocation hazard.

The snug fit of a sleep sack also provides a secure feeling similar to swaddling, which helps to soothe the infant. In addition, sleep sacks prevent infants from kicking the covers off during the night and help maintain a stable and comfortable sleeping temperature. In conclusion, the use of sleep sacks can improve the quality of your baby's sleep by creating a safe, comfortable, and conducive sleep environment.

Kaiya Baby insists on offering ideal sleep sacks for babies to sleep safely and well.

Seek Support if Needed: 

If you are feeling overwhelmed or struggling to cope with the challenges of 15-month-old sleep regression, don't hesitate to reach out to a friend, family member, or healthcare professional for support. Sometimes just knowing that you are not alone can provide the reassurance and encouragement you need to get through this challenging stage.

By implementing these strategies with love, support, and patience, you can help your toddler through the 15-month sleep regression with minimal stress and disruption. Remember, this will pass and soon you will all be able to enjoy restful nights again.

15-month-old Toddler Sleep Schedule

Creating a sleep schedule for a 15-month-old baby can help establish healthy sleep habits and promote better rest. Here's a sample sleep schedule to consider:

Wake up between 6:30 AM and 7:30 AM
Morning Nap:
Start nap around 9:00 AM to 9:30 AM
Nap duration: 1.5 to 2 hours
Wake from nap between 10:30 AM and 11:30 AM
Afternoon Nap:
Start nap around 2:00 PM to 2:30 PM
Nap duration: 1.5 to 2 hours
Wake from nap between 3:30 PM and 4:30 PM
Bedtime Routine:
Begin bedtime routine around 6:30 PM to 7:00 PM
Bedtime between 7:30 PM and 8:00 PM


This schedule must be adjusted according to your baby's individual needs and cues. Pay attention to your baby's sleep signals and adjust naps and bedtimes accordingly. Consistency is key to establishing healthy sleep habits, so try to stick to a similar schedule every day. In addition, make sure that your baby's sleep environment is conducive to rest, with a comfortable temperature, minimal noise, and a consistent bedtime routine to cue your baby that it's time to rest.


In short, experiencing a 15-month sleep regression during parenthood can feel like traveling through uncharted territory. However, with knowledge, patience, and a healthy dose of perseverance, parents can weather the storm with confidence.

Understanding the signs, causes, and coping strategies of a 15-month-old sleep regression can help alleviate anxiety and frustration, allowing both parents and babies to eventually get through this period.

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Yujia Shi

An expert in sleep sack design, is a valued contributor to Kaiya Baby's blog. With a strong background in baby sleep bags and maternal care, she is highly regarded for her professionalism. Yujia Shi prioritizes baby comfort and safety in her designs, using high-quality materials. Her insightful articles on sleep bags have been featured in reputable publications and have gained a significant readership. Trust Yujia Shi to help you create a comfortable and safe sleep environment for your baby, backed by her proven track record in the industry.

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