20-Month-Old Sleep Schedule: Naps & Wake Windows

A 20-month-old sleep schedule includes 10 to 12 hours of night sleep plus one midday nap of 1 to 2 hours (11 to 14 hours total across 24 hours), the range recommended by the American Academy of Sleep Medicine and endorsed by the AAP.¹ Bedtime falls between 7:00 and 8:30 PM, anchored by one consistent afternoon nap.

Is Your 20-Month-Old's Schedule Actually the Problem?

If you're reading this at nap time, or standing outside the door right before bedtime, you probably already have a working one-nap rhythm. And something in it just stopped working: sudden nap refusal, a bedtime that's turned into a nightly negotiation, an early wake-up that wasn't there last month. The schedule below fits most 20-month-olds. But the friction is usually developmental, not structural. Toddlers this age are moving through a wave of separation anxiety and a strong pull toward independence, and both show up at sleep transitions first. The rest of this article shows you how to tell the difference. For the full picture of sleep needs from newborn through preschool, see Pelio's baby sleep guide.

Why Does Your 20-Month-Old Sleep the Way They Do?

By 20 months, a toddler's daily rhythm runs on a mature circadian system: melatonin rises predictably at night, cortisol rises to drive morning wakefulness, and sleep is organized into distinct NREM and REM stages that look much more like an adult's pattern than an infant's, though this exact age range is genuinely understudied in the research.¹⁴ What's changing at this age isn't the biology of sleep. It's the psychology around it.

Language, Object Permanence, and the New Bedtime Protest

A 20-month-old understands, in a way a 9-month-old didn't, that a parent leaving the room means the parent is actually gone, and now has the words to protest it. That combination turns a routine goodbye into a scene. Bedtime resistance at this age often signals new cognitive sophistication, not a sleep disorder, not defiance.

Separation anxiety plays a large part. The AAP describes it as "a normal stage in children's emotional development" that disrupts a toddler's nights, with many toddlers showing new separation-related sleep challenges "at 15 or 18 months," easing around the second birthday.² ³ The anxiety itself stays developmentally active well into toddlerhood: research on childhood separation anxiety finds it remains "steadily observable" until roughly age 3, not just in early infancy.⁷ Clinically, it runs in waves: a broader window spanning roughly 10 to 24 months, and a second, more pronounced wave landing around 18 to 20 months. A toddler who wakes at night calling for a parent isn't undertired or poorly scheduled. They're anxious. That's normal.

The Autonomy Push: Why "No" Shows Up at Bedtime Too

Toddlers between 18 and 24 months are also hitting a peak drive toward autonomy and control.⁴ The AAP notes that "'No!' is how they express newly formed understanding of choice and autonomy" at this age.¹⁰ A toddler testing that "no" at the dinner table will test it at bedtime too. This isn't manipulation. Twenty-month-olds don't yet have the theory-of-mind sophistication to strategically play a parent. They're practicing the only tool they have for asserting themselves.

As pediatric sleep researcher Jodi Mindell, PhD, puts it: "Creating a bedtime routine for a child is a simple step that every family can do."⁹ A routine won't erase separation anxiety or the autonomy push, but it gives both something predictable to push against.

How Much Sleep Does a 20-Month-Old Actually Need?

The numbers below come from the American Academy of Sleep Medicine's pediatric sleep consensus, endorsed by the AAP, plus Nemours KidsHealth and Sleep Foundation data.¹ ⁵ ⁶ For how these numbers shift at other ages, see Pelio's baby sleep by age guide.

Sleep at a Glance for a 20-Month-Old

	Range	Source
Total sleep per 24 hours	11 to 14 hours	AASM, endorsed by the AAP¹
Night sleep	10 to 12 hours	Nemours KidsHealth⁵
Naps per day	1	Sleep Foundation⁶
Nap duration	60 to 120 minutes	Sleep Foundation⁶
Bedtime	7:00 to 8:30 PM	Sleep Foundation⁶
Longest night stretch	10 to 12 hours for most children	Nemours KidsHealth⁵

A child who consistently sleeps 11 hours and wakes up happy isn't sleep-deprived, and a child who needs 13 isn't unusual. Total sleep across 24 hours matters more than exactly how it splits between night and nap.

Morning Window vs. Afternoon Window: Why They're Not the Same Length

A 20-month-old's day runs on one nap, so the two wake windows around it aren't equal. See Pelio's wake windows by age guide for how these change across infancy and toddlerhood.

Window	Duration	Why
Morning (wake to nap)	5 to 6 hours	Sleep pressure builds slowly after a full night of sleep
Afternoon (nap to bedtime)	4 to 5 hours	Needs to build enough pressure for bedtime without tipping into overtiredness

The morning window stretches longer because your toddler starts it well rested. The afternoon window is shorter on purpose: push it too long and you're managing overtiredness at bedtime instead of a smooth wind-down.

What Does a Sample 20-Month-Old Daily Schedule Look Like?

Here's how those ranges play out across a real day, using a 6:30 AM wake time as the example.

Sample Schedule for a 6:30 AM Riser

• 6:30 AM: Wake, morning milk or drink
• 7:00 AM: Breakfast
• Morning: Active play, outdoor time, errands
• 11:30 AM to 12:00 PM: Quieter wind-down, lunch
• 12:00 to 1:00 PM: Nap starts (5 to 6 hours after wake)
• 1:30 to 2:30 PM: Nap ends (60 to 120 minutes)
• 2:00 to 2:30 PM: Wake, snack and drink
• Afternoon: Second active window, outdoor time, creative play
• 5:30 to 6:00 PM: Supper
• 6:15 to 6:30 PM: Begin bedtime routine (bath, pyjamas, teeth)
• 6:45 to 7:00 PM: Books, song, brief cuddle
• 7:00 to 7:30 PM: Lights out (4 to 5 hours after nap ends)

The nap is the single most important structural piece of the day. When it lands at roughly the same time daily, everything around it (meals, activity timing, bedtime) gets more predictable. If your toddler's nap consistently starts later than 1:00 PM, move bedtime later within the 7:00 to 8:30 PM range too, rather than forcing an early bedtime onto a day without enough sleep pressure yet. For nap timing at other ages, see Pelio's baby nap schedule by age guide.

Keep the bedtime routine to 15 to 30 minutes: bath, pyjamas, one or two books, a song, lights out, same order every night. Offer one bounded choice inside it, "dinosaur pyjamas or the striped ones?", so the autonomy drive has somewhere to land without taking over the sequence. Cut screens at least an hour before bedtime. That's not about content: blue light itself delays melatonin release and makes it harder to fall asleep on time.¹

My Toddler Is Suddenly Fighting the Nap or Bedtime: Do I Need to Change the Schedule?

Is Nap Refusal a Sign My Toddler Is Ready to Drop the Nap?

Almost never, at 20 months. A large systematic review of napping patterns in children found that fewer than 2.5% stop napping before age 2, with about 94% having stopped by age 5, most keeping the nap well past age 3.⁸ Pelio's clinical guidance puts the full transition to zero naps at roughly 2.5 to 3 years for most toddlers, with a range stretching to 4 years for some. For the general signs it's time to drop a nap at any age, see Pelio's when to drop a nap guide.

If your toddler is suddenly resisting the nap, the nap itself usually isn't the problem. More likely: it's offered too early or too late, your toddler is overtired by nap time, the environment changed, a developmental leap is underway, or a cold, travel, or a rough week has thrown off the routine.

A toddler who resists the nap but is glassy-eyed, tearful, or falling apart by 4 or 5 PM still needs that nap. Genuine readiness, still months away for most 20-month-olds, looks different: consistently more than 30 minutes to fall asleep at nap time, the nap disrupting night sleep, and staying awake and content without it most days, not just occasional refusal.

Is This Separation Anxiety or Is the Schedule Wrong?

Bedtime resistance at 20 months is often rooted in the separation anxiety and autonomy push described above, not a structural sleep problem. What helps: a predictable routine with a clear, defined end point ("when the song is finished, mommy leaves"), brief consistent check-ins if your toddler calls out without re-engaging the whole wind-down, and a calm, confident goodbye. The AAP's guidance on toddler bedtime trouble backs this up directly, advising parents to avoid returning to the room when a child calls out beyond a brief, boring check.¹²

Drawn-out goodbyes tend to increase separation distress, not ease it. A toddler who protests bedtime isn't manipulating you. Protest is the only communication tool they have for genuine distress, and it's common: bedtime problems and night wakings show up in roughly 20 to 30% of infants, toddlers, and preschoolers. This isn't rare, and it isn't a sign something is wrong with your child specifically.¹¹

What you're seeing	Points to a scheduling issue	Points to a developmental issue
Nap refusal	Nap offered before 12:00 PM or after 1:30 PM	Sporadic refusal, but crashes by late afternoon; started around 18 to 20 months
Bedtime resistance	Bedtime consistently later than 8:30 PM or earlier than 7:00 PM	Crying or calling specifically for a parent at the door; new "no" at every step
Night waking	Nap running past 3:00 PM, pushing bedtime late	Waking and calling out, resolved by brief reassurance, not a nap or feed
Early waking	Room too light, or bedtime too late the night before	Otherwise well-rested and happy; isolated to certain days

How Do You Know It's Time to Actually Adjust the 20-Month Schedule?

The friction covered above is normal and usually resolves without any schedule change. Here's how to tell when the schedule itself genuinely needs adjusting. If you're wondering whether your toddler is getting enough sleep overall, Pelio's is my baby sleeping enough guide walks through the bigger picture.

Signs of overtiredness (see also Pelio's dedicated overtired baby signs guide):

• A "second wind," a sudden burst of energy right after the optimal window closes
• Escalating resistance to everything, including the wind-down itself
• Trouble settling despite obvious exhaustion
• Meltdowns over minor triggers
• Taking far longer to fall asleep than the level of fatigue would suggest

A wired, manic toddler at bedtime is usually an overtired one, not an undertired one. Overtiredness is linked to elevated cortisol, which produces an arousal effect that mimics wakefulness.¹³

Sleepy cues to watch for before the window closes:

• Increased clumsiness
• Emotional reactions bigger than the trigger warrants
• Losing interest in play
• Seeking a comfort object or a parent's lap
• Eye rubbing, yawning
• Going quieter and less socially engaged

When the nap transition eventually arrives, months away for most 20-month-olds, it looks like this: more than 30 minutes to fall asleep at nap time on most days, the nap disrupting night sleep, and your toddler staying awake and content without it, not the occasional refusal covered above.

Call your pediatrician if:

• Your toddler is consistently sleeping under 10 hours in 24 hours and showing signs of sleep deprivation
• You notice loud snoring, mouth breathing, or pauses in breathing during sleep
• Night terrors are frequent
• Your toddler seems excessively sleepy during the day despite what looks like adequate sleep
• Sleep disruption is showing up alongside a broader developmental regression

What This Means for You Tonight

If the nap is being refused, hold the 12:00 to 1:00 PM window anyway. Keep the pre-nap ritual and offer quiet rest even if sleep doesn't come; don't assume readiness to drop it.

If bedtime is a fight, keep the routine to 15 to 30 minutes and make the goodbye brief and calm. A long, drawn-out goodbye tends to make separation distress worse, not better.

If night waking has increased, check whether it clusters around a developmental leap or a genuine schedule drift (nap past 1:30 PM, bedtime past 8:30 PM) before changing anything structural.

If the disruption is still going after a few weeks with no improvement, or you notice any breathing concerns during sleep, call your pediatrician.

Bedtime is where it shows up first. One parent on r/toddlers described a 20-month-old "fighting bedtime hard lately — I'm talking hours for her to fall asleep at night," a toddler who would act tired and then "suddenly have all this energy. You would think it's 11 am or something." (r/toddlers, April 2026).

More by age: 19-month sleep schedule · 21-month sleep schedule · every age in one place

Frequently Asked Questions

How many naps should a 20-month-old have?

One nap, 60 to 120 minutes, usually starting between 12:00 and 1:00 to 1:30 PM.⁶ Two naps are no longer typical: that transition usually finishes by 13 to 18 months. A third or late nap pushes bedtime too late, so trim a late catnap after 3:00 PM rather than add to it.

What time should a 20-month-old go to bed?

Somewhere between 7:00 and 8:30 PM, driven by when the nap ends and the 4 to 5 hour afternoon window.⁶ An earlier bedtime (7:00 to 7:30 PM) often suits a shorter or dropped nap; a later one (8:00 to 8:30 PM) suits a longer nap or a later-working family. The exact clock time matters less than keeping it consistent night to night.

My toddler is refusing naps. Does that mean it's time to drop the nap?

Almost never at 20 months. The genuine 1-to-0 transition happens between 2.5 and 3 years, and a systematic review found fewer than 2.5% of children stop napping before age 2.⁸ Sporadic refusal is far more often overtiredness, a mistimed nap, or a developmental leap. Rule of thumb: a toddler who refuses the nap but is exhausted and tearful by late afternoon still needs it. Genuine readiness looks like consistently more than 30 minutes to fall asleep at nap time, the nap disrupting night sleep, and staying content without it, not just for a day or two.

Why is my 20-month-old suddenly fighting bedtime?

The most common drivers are a second, more intense wave of separation anxiety, common around 18 to 20 months in Pelio's clinical experience, and a peak drive toward autonomy and control spanning roughly 18 to 24 months, not a broken schedule or sleep association problem.² ⁴ A short, consistent routine with a clear end point and a calm, brief goodbye tends to help more than any schedule change. This is a sign of normal development, not a signal something is wrong with your toddler or your routine.

How long should a 20-month-old be awake between sleep periods?

About 5 to 6 hours in the morning, wake-up to nap, and 4 to 5 hours in the afternoon, nap to bedtime.⁶ The windows aren't the same length on purpose: the morning window stretches longer because your toddler starts the day well rested, while the afternoon window has to build just enough sleep pressure for bedtime.

My 20-month-old is waking at night and calling for me. What's happening?

Most night waking at this age comes down to separation anxiety, leftover sleep associations from infancy, or a developmental leap, not hunger or insufficient sleep pressure.² Nutritional night feeds aren't necessary at 20 months for toddlers eating adequately during the day.¹⁵ A brief, calm check-in, without turning on the light or restarting the bedtime routine, tends to help your toddler settle faster than a longer, more engaged response.

More Sleep Schedules by Age

Sleep needs and schedules change quickly in the first few years. If you have a younger sibling at home, or want to see how today's schedule got here:

• 3-month sleep schedule
• 6-month-old sleep schedule
• 9-month wake windows
• 4-month sleep regression
• 8-month sleep regression

Sources

1. Paruthi S, Brooks LJ, D'Ambrosio C, et al. "Recommended Amount of Sleep for Pediatric Populations: A Consensus Statement of the American Academy of Sleep Medicine." Journal of Clinical Sleep Medicine. 2016;12(6):785-786. https://jcsm.aasm.org/doi/10.5664/jcsm.5866 (endorsed by the American Academy of Pediatrics: https://www.healthychildren.org/English/healthy-living/sleep/Pages/healthy-sleep-habits-how-many-hours-does-your-child-need.aspx)
2. American Academy of Pediatrics / HealthyChildren.org. "Separation Anxiety & Sleeping Trouble in Young Children." Updated 2022. https://www.healthychildren.org/English/healthy-living/sleep/Pages/separation-anxiety-and-sleeping.aspx
3. American Academy of Pediatrics / HealthyChildren.org. "How to Ease Your Child's Separation Anxiety." https://www.healthychildren.org/English/ages-stages/toddler/Pages/Soothing-Your-Childs-Separation-Anxiety.aspx
4. Centers for Disease Control and Prevention. "Developmental Milestones: 18 Months." https://www.cdc.gov/ncbddd/actearly/milestones/milestones-18mo.html
5. Nemours KidsHealth. "Sleep." https://kidshealth.org/en/parents/sleep.html
6. Sleep Foundation (medically reviewed by Nilong Vyas, MD, MPH). "How Much Sleep Do Kids Need?" https://www.sleepfoundation.org/children-and-sleep/how-much-sleep-do-kids-need ; "How Long Should a 2-Year-Old Nap?" https://www.sleepfoundation.org/napping/how-long-should-a-2-year-old-nap ; "When Should Kids Stop Taking Regular Naps?" https://www.sleepfoundation.org/children-and-sleep/when-do-kids-stop-napping
7. Feriante J, Torrico TJ, Bernstein B. "Separation Anxiety Disorder." StatPearls [Internet]. StatPearls Publishing; updated 2023. PMID: 32809628. https://pubmed.ncbi.nlm.nih.gov/32809628/
8. Staton S, Rankin PS, Harding M, et al. "A systematic review and meta-analysis of napping patterns in children 0-12 years." Sleep Medicine Reviews. 2020;50:101247. PMID: 31862445. https://pubmed.ncbi.nlm.nih.gov/31862445/
9. Mindell JA, Li AM, Sadeh A, Kwon R, Goh DY. "Bedtime routines for young children: a dose-dependent association with sleep outcomes." SLEEP. 2015;38(5):717-722. DOI: 10.5665/sleep.4662. Expert quote via AASM press release: https://aasm.org/study-shows-that-children-sleep-better-when-they-have-a-nightly-bedtime-routine/
10. American Academy of Pediatrics / HealthyChildren.org. "Your Checkup Checklist: 18 Months Old." Updated 2022. https://www.healthychildren.org/English/ages-stages/Your-Childs-Checkups/Pages/your-checkup-checklist-18-months-old.aspx
11. Morgenthaler TI, Owens J, Alessi C, et al. "Practice parameters for behavioral treatment of bedtime problems and night wakings in infants and young children." SLEEP. 2006;29(10):1277-1281. https://aasm.org/wp-content/uploads/2017/07/PP_NightWakingsChildren.pdf
12. American Academy of Pediatrics / HealthyChildren.org. "Toddler Bedtime Trouble: 7 Tips for Parents." Updated 2022. https://www.healthychildren.org/English/healthy-living/sleep/Pages/bedtime-trouble.aspx
13. Scher A, Hall WA, Zaidman-Zait A, Weinberg J. "Sleep quality, cortisol levels, and behavioral regulation in toddlers." Developmental Psychobiology. 2010;52(1):44-53. PMID: 19921708. https://pubmed.ncbi.nlm.nih.gov/19921708/
14. Lenehan SM, Fogarty L, O'Connor C, Mathieson S, Boylan GB. "The Architecture of Early Childhood Sleep Over the First Two Years." Maternal and Child Health Journal. 2023;27(2):226-250. PMID: 36586054. https://pmc.ncbi.nlm.nih.gov/articles/PMC9925493/
15. NHS. "Helping your baby to sleep." https://www.nhs.uk/conditions/baby/caring-for-a-newborn/helping-your-baby-to-sleep/

Track Your 20-Month-Old's Schedule Without the Guesswork

Telling apart "the nap is genuinely off" from "this is separation anxiety again" is hard at 11 PM with nothing but memory to go on. Pelio logs your toddler's naps, night wakings, and bedtime automatically, so you see the actual pattern instead of guessing.

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