Caleb MorganBy Caleb Morgan

Updated November 2026

If your toddler won’t sleep through the night anymore, you are far from alone. Sleep that used to be steady can break down around 12 to 24 months, again around age 2 or 3, and during any stretch of change. This guide walks you through the most common causes, a practical seven-step plan to rebuild longer stretches of sleep, and the signs that mean you should bring the issue to your child’s doctor.

Most night wakings have a traceable reason: a shift in daytime naps, a new skill like standing or climbing, a cold, teething, or a bedtime routine that has drifted. The fix is usually less about a single trick and more about checking a few variables in order.

Shopping for one? See our guide: 6 Best Toddler Won't Sleep at Night Books and Aids for Bedtime (2026).

Why Toddlers Stop Sleeping Through the Night

Toddler sleep is not a fixed skill. It is shaped by brain development, daytime activity, and the environment at bedtime. Sleep researchers generally describe toddler sleep as moving through light and deep cycles, with brief partial awakenings between them. Most children can resettle on their own, but a child who has learned to rely on a parent to fall back asleep may wake fully and call out when that cycle ends.

Common triggers include:

  • Developmental leaps. New motor skills (pulling up, climbing out of the crib) and language bursts often show up at night as restlessness.
  • Nap changes. Many toddlers move from two naps to one somewhere between 15 and 18 months. A transition that comes too early or too late can leave a child overtired or undertired at night.
  • Illness and discomfort. Ear infections, colds, teething, reflux, and constipation all disrupt sleep.
  • Separation worries. Peak separation anxiety often appears around 18 months to 2 years.
  • Hunger or thirst. A child who drops a feed or who eats very little at dinner may wake for food.
  • Environment. Light, noise, temperature, or a room that has changed (a new house or new sibling) can all matter.

Step-by-Step Plan to Restore Longer Stretches of Sleep

Step 1: Check the Daytime Nap Schedule

Start here, because nap problems are the most common hidden cause. A toddler who naps too long in the afternoon may not be tired enough at bedtime. A toddler who skips a needed nap becomes overtired, and overtired children often sleep in short, fragmented bursts.

Rough total daytime sleep guidelines commonly cited by pediatric sleep sources for this age range:

Age Total 24-hour sleep (typical range) Usual nap pattern
12–15 months 12–14 hours Two naps, often 1 to 2 hours total each
15–18 months 11–14 hours Transition period, one or two naps
18 months–3 years 11–14 hours One afternoon nap, often 1 to 3 hours
3–4 years 10–13 hours Nap may be dropped or shortened

If your child’s nap is consistently longer than about three hours, or starts after 3 p.m., try shortening it by 15 to 20 minutes every few days, or waking them gently. If bedtime is a battle and your child is clearly overtired by early evening, moving bedtime earlier by 15 minutes can help more than pushing it later.

For more on how daytime rest affects the night, see Toddler Won't Sleep During the Day? 7 Steps That Help (2026) and Toddler Developmental Milestones and Sleep: What to Expect Ages 1–4.

Step 2: Review the Bedtime Routine

A consistent, calming routine of about 20 to 30 minutes tells the brain it is time to wind down. Keep it predictable: bath or wash-up, pajamas, teeth, two books, a song, lights low, and the same goodnight words each night.

Avoid screens for at least an hour before bed, keep active play earlier in the evening, and make sure dinner is substantial enough that hunger does not wake your child at 2 a.m.

Step 3: Build Independent Resettling Skills

Many night wakings continue because a toddler has learned that a particular cue (being rocked, nursed, or held) is needed to fall back asleep. Gradually changing that association helps them learn to settle independently between cycles.

  1. Choose one change to work on, such as moving from rocking to sitting beside the crib.
  2. Put your child down drowsy but awake.
  3. When they wake, wait a short interval (start at 2 to 3 minutes) before responding.
  4. Respond briefly and calmly: a hand on the back, a quiet word, no lights, no picking up.
  5. Gradually lengthen the wait over several nights, and keep your response boring.

Expect a few harder nights. Consistency matters more than any particular method, and it is fine to pause and try again later. A related guide on independence is Toddler Won't Sleep Unless Held: 7 Steps to Independent Sleep.

Step 4: Look for Medical Causes

Pain and illness often masquerade as behavior. Watch for ear pulling, a fever, coughing, mouth breathing or snoring, a runny nose, or waking crying and inconsolable. Constipation can also cause night waking in toddlers, especially after a change in diet or potty training.

If you notice snoring most nights, pauses in breathing, or your child seems very tired during the day, speak with your pediatrician promptly, as sleep-disordered breathing needs professional evaluation.

Step 5: Check the Sleep Environment

Aim for a dark, quiet, and comfortable room. Blackout curtains help with early summer light, and a white noise machine can mask household sounds. Many sleep guidelines suggest a room temperature around 68 to 72°F (20 to 22°C) for comfort.

Make sure the crib or bed is safe and that bedding is appropriate. Loose blankets, pillows, and stuffed animals are not recommended in cribs for children under age 1, and many pediatric groups advise a firm, flat surface with a fitted sheet only. Once your child is older and moving to a toddler bed, a wearable blanket can keep them warm without loose covers. The Halo SleepSack Wearable Blanket is one widely sold option.

Step 6: Address Hunger and Thirst

Offer a balanced dinner with protein, fat, and complex carbohydrates. A small, non-sugary snack before bed can help some children. Offer water with meals, but limit milk or other drinks close to bedtime to reduce the chance of night wakings for a drink or diaper changes.

Step 7: Stay Consistent and Track Progress

A sleep log for one to two weeks is a simple, useful tool. Record bedtime, wake times, nap length, meals, and any night wakings. Patterns often appear quickly. Make one change at a time so you can tell what helps.

Common Mistakes to Avoid

  • Changing several things at once, so you cannot tell what is working.
  • Giving up after two or three nights of a new approach.
  • Turning on lights or starting play when your child wakes at night, which signals it is time to get up.
  • Keeping a long afternoon nap in place while expecting a full night of sleep.
  • Ignoring signs of illness, reflux, or breathing problems and assuming it is behavioral.
  • Letting bedtime drift later and later on weekends or during trips.

Tips for Making the Plan Stick

  • Use a visual bedtime chart if your child can follow pictures.
  • Keep the same bedtime within about 30 minutes, including weekends.
  • Give a simple, positive reason for sleep, such as “your bed is for sleeping.”
  • Prepare for short-term setbacks during illness, travel, or a new sibling.
  • Take care of your own sleep where you can, since a rested parent is better able to stay consistent.

These tools can support the steps above. They are general-purpose products and are not a substitute for a sleep plan.

  • Blackout curtains help block early morning light and make the room darker for naps and nights. Search: View on Amazon
  • White noise machine can mask household sounds and create a consistent background. Search: View on Amazon
  • Wearable blanket keeps a toddler warm once loose bedding is no longer safe. Search: View on Amazon
  • Toddler clock or sleep trainer gives a simple visual cue for when it is time to stay in bed. Search: View on Amazon

FAQ

How long does it take to fix a toddler who won’t sleep through the night?

Many families see some improvement within one to two weeks of consistent changes. Full, stable sleep can take several weeks, especially if illness or a developmental leap is also involved.

Is it normal for a toddler to stop sleeping through the night around 18 months?

Yes. Nap transitions, separation anxiety, and new skills commonly disrupt sleep around this age. The disruption is usually temporary, but a plan can shorten it.

Should I night wean my toddler if they still wake to nurse?

Night weaning is a personal decision. If you choose it, gradually reduce feeds over days and offer comfort in other ways. Talk with your pediatrician if you have concerns about nutrition or your own health.

When should I call the pediatrician about night waking?

Call promptly if your child has snoring with pauses in breathing, fever, ear pulling, persistent cough, signs of pain, or sudden changes in behavior. Consult a professional for any concern about breathing or development.

Can screens cause my toddler to wake at night?

Screens close to bedtime can make it harder to settle because of stimulation and light. Limiting screens in the hour before bed is a commonly recommended step.

Does my toddler need a nap if they are waking at night?

Not necessarily, but a nap that is too long or too late can interfere with nighttime sleep. Adjust the nap length or timing before dropping it entirely.

Why does my toddler wake up at the same time every night?

This often points to a sleep cycle that is ending, a hunger or bladder cue, or an environmental trigger such as a noise or temperature change. A sleep log can help you spot the pattern.

Conclusion

When your toddler won’t sleep through the night anymore, start by checking naps, the bedtime routine, and any illness or discomfort. Then work through independent resettling and the sleep environment one change at a time. Keep a simple log, stay consistent, and expect a few hard nights along the way. If you have ongoing concerns, talk with your pediatrician.

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Caleb Morgan

About Caleb Morgan

Caleb Morgan is part of our editorial team and reviews and edits our toddler development & behavior guides, checking product details against manufacturer specifications and owner feedback.