If your toddler was sleeping well and suddenly is not, you are probably dealing with a sleep regression. Your child was going down easily, staying asleep through the night, and then something shifted. Now bedtime battles are back, 2 a.m. wakings have returned, and nobody in your house is getting enough rest.
Sleep regressions are a normal part of child development — but knowing that does not make them easier to live through. This guide breaks down when sleep regressions happen by age, what causes each one, and what you can actually do to get through it.
What Is a Sleep Regression?
A sleep regression is a period when a child who was sleeping well suddenly starts waking more frequently, resisting sleep, or napping in shorter stretches. Regressions typically last two to six weeks, though they can stretch longer when families are navigating other changes like a new sibling, a move, or starting daycare.
During a regression, nothing is broken. Your child has not unlearned how to sleep. What is happening is that their brain is developing rapidly, and that growth disrupts the routines that once worked. Regressions are temporary — but they are easier to navigate when you understand what is driving them at each age.
Toddler Sleep Regression Ages: When to Expect Them
The 12-Month Sleep Regression
When it hits: Around the first birthday, often between 11 and 13 months.
What is happening developmentally: Your baby is likely on the verge of walking — or has just started. They are also experiencing a surge in language development and may be transitioning from two naps to one. All of this creates a perfect storm of sleep disruption.
Signs of the 12-month regression:
- Increased night wakings after months of sleeping through
- Resistance to naps or shortened nap times
- More fussiness and clinginess at bedtime
- Early morning wakings
How to cope: Hold steady with your routine. The nap transition from two to one can feel bumpy — some days your toddler may need two short naps, others just one longer one. Aim for the single nap to happen around noon to 1 p.m. once the transition is underway. Keep bedtime consistent even when naps are irregular.
The 18-Month Sleep Regression
When it hits: Between 17 and 20 months. This is one of the most intense sleep regressions parents report.
What is happening developmentally: The 18-month regression coincides with a massive leap in autonomy. Toddlers this age are asserting independence in every area of life — sleep included. They understand more of what is being said to them, they are developing opinions, and separation anxiety often peaks around this time. Combine that with the onset of molars for many kids, and you have a rough stretch.
Signs of the 18-month regression:
- Strong protests at bedtime (crying, screaming, climbing out of the crib)
- Multiple night wakings with demands for a parent’s presence
- Early rising despite seeming exhausted
- Increased tantrums around sleep times
How to cope: The 18-month regression often requires parents to recommit to consistent responses. If your toddler has learned that crying will bring you back into the room, the regression period can stretch out. Decide in advance how you want to respond — brief check-ins, extended comfort, or staying until they fall asleep — and apply that response consistently every night. Inconsistency tends to prolong regressions at this age.
The 2-Year Sleep Regression
When it hits: Around the second birthday, sometimes as early as 20 months or as late as 26 months.
What is happening developmentally: The 2-year sleep regression often coincides with several big changes at once: the transition from crib to toddler bed, potty training beginning, and an explosion in language and imagination. Many 2-year-olds are also experiencing an increase in nighttime fears as their imagination becomes more active.
Signs of the 2-year regression:
- Bedtime stalling (“one more hug,” “I need water,” “I’m scared”)
- Nighttime fears or reports of bad dreams
- Difficulty settling at naptime or dropping naps
- Resistance to the crib-to-bed transition
How to cope: A predictable, calming bedtime routine is your most powerful tool at this age. Two-year-olds thrive on knowing exactly what comes next. If fears are present, validate them without reinforcing avoidance — acknowledge the fear, provide comfort, and gently hold the boundary. A nightlight and a comfort object can help. For families navigating the crib-to-bed transition at the same time, consider delaying non-urgent transitions until sleep has stabilized.
The 3-Year Sleep Regression
When it hits: Between 3 and 3.5 years, often correlating with the start of preschool or other big life changes.
What is happening developmentally: Three-year-olds are in the thick of imaginative play, and their brains do not always power down easily. Nightmares and night terrors become more common at this age. Many children this age are also working through big social experiences at school, processing them during sleep. This is also the time when many children transition away from naps entirely, which can make the stretch from lunch to bedtime feel very long.
Signs of the 3-year regression:
- Difficulty falling asleep despite seeming tired
- Nightmares or night terrors
- Requests for a parent to stay in the room
- Dropping naps but still struggling to make it to bedtime
How to cope: A consistent wind-down routine that starts 30 to 45 minutes before sleep helps 3-year-olds shift gears. Limit screens in the hour before bed, which can overstimulate. If nightmares are a factor, validate the fear briefly, then use a calm and confident tone to reassure your child that they are safe.
Regression vs. Other Sleep Issues
Not every stretch of bad sleep is a regression. It helps to distinguish between:
- Regression: Temporary disruption tied to developmental leaps, with a clear start point in a previously good sleeper. Usually resolves in two to six weeks.
- Sleep association problem: Your child needs a specific condition (nursing, rocking, a parent’s presence) to fall asleep, and wakes at night needing that condition to be re-created. This is common and fixable, but it does not resolve on its own the way a regression does.
- Environmental factors: Illness, travel, a new sibling, or daycare transitions can all temporarily disrupt sleep. These often resolve when the disruption passes. For more on how toddler regression after a new baby can affect sleep, see our complete guide.
- Nap timing issue: If nap times shift and do not adjust, this can push bedtime back and create early-morning wakings. Adjusting the schedule often helps.
If your child’s sleep challenges persist beyond eight weeks, or if you notice other developmental concerns alongside the disruption, speak with your pediatrician.
Strategies That Help During Any Sleep Regression
Regardless of the age, a few approaches tend to make regressions shorter and less miserable:
Keep the Routine Consistent
Sleep regressions are not the time to experiment with new schedules. Your child’s nervous system craves predictability during periods of rapid growth. A bedtime routine that is the same every night — bath, pajamas, books, song, lights out — provides an anchor when development is in flux.
For more on why some toddlers take so long to fall asleep and how to help, that guide goes deeper on bedtime stalling and calming wind-down routines.
Respond Without Creating New Habits
It is okay to offer comfort during a regression. The goal is to respond to your child’s increased need without introducing new sleep associations that will be hard to break once the regression ends. Brief check-ins, a reassuring voice through the door, or a short cuddle before returning to your own bed can balance compassion with consistency.
Protect Daytime Sleep
When nights are rough, the instinct is to keep your toddler up later to compensate. This usually backfires. Overtired toddlers have a harder time falling asleep and staying asleep. Protect nap times during regressions. If your child is resisting the nap, try an earlier bedtime instead.
Lean Into Daytime Connection
Children going through a developmental leap often need more daytime connection with caregivers. Extra one-on-one time, physical play, and responsive interaction during the day can reduce the intensity of bedtime separation anxiety at night. This aligns with the kind of relationship-centered care we prioritize at Strong Start, where teachers build genuine bonds with children that help them feel secure both during the day and at night.
Adjust Your Expectations Temporarily
Regressions are finite. Knowing that this will end — typically within two to six weeks — helps parents weather the sleepless nights with more patience. Lower your expectations for productivity during this stretch, and ask for help if you need it.
When Should You Be Concerned?
Most sleep regressions are a normal part of development. Contact your child’s pediatrician if:
- The sleep disruption lasts longer than eight weeks with no improvement
- Your child seems in pain, is not eating well, or is not meeting developmental milestones
- You notice other behavioral changes alongside the sleep disruption
- Night terrors are frequent, very prolonged, or associated with injury risk
Sleep and Development Go Hand in Hand
At Strong Start Early Care and Education, we know that what happens at night affects how children show up during the day. Well-rested children are better able to engage in the play-based learning and relationship-building that forms the foundation of early childhood development. Our Reggio Emilia-inspired approach supports children’s growth across all domains — including the emotional regulation skills that make it easier for children to settle and sleep.
If you have questions about your child’s development, sleep, or readiness for our programs, we are here to help. We serve families in Trumbull, Wilton, and Bridgeport, Connecticut. To learn more about what makes Strong Start different, explore our guide on toddler speech development or schedule a tour today.
Frequently Asked Questions About Toddler Sleep Regressions
How long does a toddler sleep regression last?
Most sleep regressions last two to six weeks. The duration depends on the age of the child, how consistent caregivers are in their responses, and whether other life changes are compounding the disruption. Regressions tied to major transitions — such as starting preschool or welcoming a new sibling — may last longer.
Do all toddlers go through sleep regressions?
Not every child experiences every regression with equal intensity. Some children move through developmental leaps with minimal sleep disruption, while others are more sensitive to the changes. Both are normal. If your child has consistently slept well and suddenly hits a rough patch, a regression is the most likely explanation.
What is the hardest toddler sleep regression?
Parents most commonly report the 18-month sleep regression as the most difficult. This is because it coincides with a significant surge in autonomy and separation anxiety, making consistent responses harder to maintain when a toddler is screaming at the door.
Is the 2-year sleep regression real?
Yes. The 2-year sleep regression is well-documented and coincides with several simultaneous developmental changes including language explosion, increased imagination and associated nighttime fears, and often the crib-to-bed transition.
Should I change my toddler’s sleep schedule during a regression?
In most cases, no. Maintaining the existing schedule provides stability during a period of development. The exception is if the schedule has clearly shifted — for example, a nap that has become too long and is pushing bedtime back significantly. In that case, a modest schedule adjustment may help.
How do I know if it is a sleep regression or something else?
A regression is typically tied to a specific developmental milestone, has a clear onset in a previously good sleeper, and resolves within a few weeks. If the disruption persists beyond two months, is accompanied by other symptoms such as ear pain, fever, or refusal to eat, or does not follow a clear developmental trigger, contact your pediatrician.
Written By
Marc Hoffman
Founder, Strong Start Early Care & Education
Marc founded Strong Start in 2014, inspired by his studies at Williams College, Yeshiva University, and research at Yale University. His child-centered, inquiry-based approach to early education has helped hundreds of families in the Trumbull and Bridgeport communities. As a parent himself, Marc understands the importance of finding a nurturing environment where every child can learn, grow, and flourish.
