
Sleep regression is a common phenomenon among toddlers and babies, and it can be a challenging phase for both parents and children. It usually occurs when toddlers are going through significant growth and development, such as learning to walk, talk, or potty train. The 15-month sleep regression is often associated with nap transitions, where toddlers are ready to transition from two naps to one during the day. This change can disrupt their sleep patterns, leading to difficulties in settling and an overall regression in sleep quality. While this phase typically resolves within a few weeks, it can be daunting for parents who are already sleep-deprived. Fortunately, there are strategies to help toddlers and parents navigate this tricky period and improve sleep habits.
| Characteristics | Values |
|---|---|
| Age | 3-4 months, 6 months, 8-10 months, 12 months, 15 months, 18 months, 2 years, and 3 years |
| Symptoms | More frequent night waking, trouble falling asleep, increased fussiness, resisting naps, separation anxiety, stalling techniques, power struggles, nightmares, teething, fever, nasal discharge, coughing, swollen glands, earache |
| Solutions | Spend 10-15 minutes of 1-on-1 time with your child during the day, introduce a comfort object, give your child a sense of control and independence by offering choices, make small tweaks to your child's bedtime routine, Ferber method, set a timer and leave the room, carry your child back to their room if they wander into yours |
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What You'll Learn

Separation anxiety
Sleep regression can be a challenging phase for both toddlers and their parents. It often happens at 3 to 4 months, 6 months, 8 to 10 months, 12 months, 15 months, 18 months, 2 years, and 3 years. It is characterised by more frequent night waking, trouble falling asleep, increased fussiness, and sudden resistance to naps. While sleep regression usually resolves on its own within a few weeks, it can be a frustrating and exhausting experience for parents.
To address separation anxiety, it is crucial to establish healthy attachments and provide reassurance. Here are some strategies to help manage separation anxiety in 15-month-old toddlers:
- Practice being apart: Gradually introduce your toddler to new caregivers and environments. Start by inviting new caregivers into your home while you are still present, and gradually increase the duration of separation.
- Develop routines: Establish a consistent bedtime routine to provide a sense of security. A brief goodbye routine can also be helpful, such as a quick hug and a reminder that you will return after work.
- Offer choices: Provide your toddler with a sense of control and independence by offering them choices. For example, you can ask them to choose between two options, such as their bedtime story or pyjama colour.
- Spend intentional 1-on-1 time: Aim for 10-15 minutes of undivided attention during the day. This can make a significant difference at bedtime, as it fulfils their need for connection and security.
- Introduce comfort objects: If your toddler is over 12 months old, consider introducing a comfort object, such as a soft toy or blanket. Research suggests that sleeping with a lovey can reduce sleep problems and provide a sense of familiarity.
- Convey temporary separation: When leaving your toddler with a trusted caregiver, emphasise that the separation is temporary. Avoid sneaking out while they are distracted, as this may cause confusion and worry.
Remember, every toddler is unique, and the timing and intensity of separation anxiety can vary. Be patient, consistent, and responsive to your toddler's needs. If you have concerns or if separation anxiety interferes with their daily activities, consider seeking advice from a healthcare professional.
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Physical development
Sleep regression in 15-month-old toddlers is often related to their physical development. At this age, toddlers are learning new motor skills, such as walking, running, jumping, climbing, and throwing or kicking balls. They are also developing fine motor skills, such as feeding and dressing themselves, and grasping objects like crayons. This rapid physical development can impact their sleep as their brains are busy processing and consolidating these new skills.
Additionally, toddlers at this age are experiencing a significant growth spurt, becoming bigger, more active, and more responsive. Their increased activity levels and awareness of their surroundings can lead to restlessness during sleep. They may also start to refuse naps or bedtime, which can be attributed to their increasing desire for independence and autonomy. It's common for toddlers to transition from two naps to one nap during the day, and this adjustment can disrupt their previous sleep patterns.
To address sleep regression related to physical development, here are some strategies:
- Encourage physical activity during the day: Ensure your toddler gets ample opportunities for physical play and exploration. This can help tire them out physically and mentally, making them more likely to sleep soundly at night.
- Establish a bedtime routine: A consistent bedtime routine can signal to your toddler that it's time to wind down and prepare for sleep. Include calming activities such as a warm bath, reading a book, or singing lullabies to help relax their bodies and minds.
- Create a soothing sleep environment: Make sure your toddler's bedroom is conducive to sleep. Keep the room dark, quiet, and at a comfortable temperature. Consider using white noise or a fan to block out any distracting sounds.
- Offer comfort objects: Introduce a lovey or comfort object if you haven't already. Research suggests that sleeping with a familiar object can help reduce sleep problems and provide a sense of security during the night.
- Address any discomfort: Ensure your toddler is sleeping comfortably. For example, if they are teething, offer appropriate pain relief or teething toys to help soothe their discomfort and promote better sleep.
- Maintain a consistent sleep schedule: Try to stick to a regular sleep schedule as much as possible. This will help regulate your toddler's body clock and encourage them to nap or sleep at consistent times.
Remember, sleep regression is a normal part of your toddler's development. By focusing on healthy sleep habits and providing a supportive environment, you can help your 15-month-old navigate through this challenging period and establish better sleep patterns.
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Restlessness and overstimulation
To address restlessness and overstimulation, it is important to establish consistent and healthy sleep habits. A bedtime routine can provide a sense of structure and security for your toddler. This routine should include a designated bedtime, a quiet and comfortable sleep environment, and consistent sleep habits such as reading a book or offering a comfort object.
It is also crucial to consider your toddler's daily activities and environment. Ensure that your toddler is getting adequate downtime between different activities and that they are not overexposed to stimulating environments, such as noisy or crowded places. Excessive screen time should be avoided, especially before bedtime, as it can overstimulate your toddler and interfere with their sleep.
Separation anxiety can also contribute to restlessness and overstimulation. Spending dedicated one-on-one time with your toddler during the day can help strengthen your bond and provide a sense of security. Additionally, offering choices to your toddler can give them a sense of control and independence, which may reduce their anxiety and improve their sleep.
Finally, it is important to remember that every toddler is unique, and their sleep patterns may vary. Some toddlers may experience overstimulation more frequently or intensely than others. If you notice that your toddler's behaviour interrupts their everyday routines or their reactions are difficult to manage, it is advisable to consult your paediatrician or a healthcare professional for personalised advice.
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Teething
Sleep regression in 15-month-olds can be attributed to teething, motor leaps, and boundary testing. Teething discomfort can lead to a sudden and significant decline in sleep quality, and it is important to note that teething pain can be inconsistent, with pain levels fluctuating from day to day.
To help your 15-month-old through teething-related sleep regression, consider the following strategies:
- Offer pain relief before naps or at night to alleviate gum discomfort and help your child relax into sleep.
- Move bedtime 15-30 minutes earlier to compensate for lost sleep and avoid overtiredness, which can further disrupt sleep patterns. However, ensure bedtime remains no earlier than 6:00 PM.
- Stick to your child's normal bedtime routine as much as possible to provide consistency and avoid prolonging sleep challenges.
- Provide comfort measures such as gum massages and extra cuddles to soothe your child. Remember that offering comfort during this time will not derail their sleep foundation.
- Once the tooth has erupted, return to your usual sleep approach, and your child's sleep should quickly return to normal.
It is important to note that sleep regression can be caused by various factors, and teething is just one piece of the puzzle. Other potential causes include separation anxiety, physical development, emotional growth, and mental progression. As every child is unique, it is essential to consider multiple strategies to address sleep regression and consult with a pediatrician if concerns arise.
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Sickness, travel, or life changes
Sickness
If your baby is unwell, their sleep may be disrupted due to the discomfort and symptoms of their illness. Fever, nasal discharge, coughing, swollen glands, and earaches are common signs that your baby may be sick. It is important to look out for these symptoms and consult your pediatrician if they persist or if you are concerned. Stick to your normal bedtime and sleep routines as much as possible, as familiarity can be reassuring for your baby.
Travel
Travel can disrupt your child's sleep schedule and lead to sleep regression. Jet lag and a shift in their circadian rhythm can cause their internal clock to become mismatched with the local time. To mitigate this, gradually adjust their sleep schedule before or after the trip to ease them back into their regular routine. Additionally, try to maintain consistent sleep associations and strategies while traveling to minimize disruptions.
Life Changes
Major life changes or milestones, such as separation anxiety, teething, fear of the dark, or learning new motor skills, can impact your toddler's sleep. These changes can cause stress and insecurity, leading to more frequent night wakings and difficulty falling asleep. To help your baby feel more secure, establish a consistent bedtime routine and sleep schedule. This consistency can reduce the likelihood of sleep problems and provide a sense of familiarity during times of change.
Remember, sleep regression is a normal part of your toddler's development, and it will likely pass with time. If you have concerns or need advice, don't hesitate to reach out to your doctor or a sleep consultant for personalized guidance.
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Frequently asked questions
Sleep regression in 15-month-olds could be due to separation anxiety, physical development, restlessness and overstimulation, teething, nightmares, or sickness.
Sleep regression usually lasts for a few weeks. However, it varies from child to child, depending on factors like their sleep habits, environment, and overall development.
Signs of sleep regression include more frequent night waking, trouble falling asleep at bedtime, increased fussiness, and suddenly resisting naps.
Spend 10-15 minutes of intentional and undistracted one-on-one time with your toddler during the day. You can also introduce a comfort object like a lovey if your child is over 12 months old. Stick to a bedtime routine, but allow your child to make small decisions along the way.
Sleep regression will likely end on its own with time. However, if you've consistently stuck to a sleep training method for at least two weeks and your child still has trouble sleeping, consider contacting your doctor for advice. Also, watch out for signs of sickness, such as fever, nasal discharge, coughing, swollen glands, or an earache.











































