Sleep
15 Month Old Sleep Schedule: Wake Windows, One or Two Naps and a Sample Day
15 month old sleep schedule: 11–14 hours of sleep, wake windows of 165–250 minutes on a two-nap day (longer on one nap), one or two naps and a sample day with clock times.
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This article is for general information and is not a substitute for professional medical advice. Always consult your pediatrician or doctor about your child.
Sources: WHO, CDC, AAP and NHS guidance. Recommendations differ between countries — for local advice see the NHS or CDC.
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15 month old sleep at a glance
At 15 months most children are awake for long stretches and sleep in one or two daytime naps. Below are the typical ranges for this age, a sample day with clock times and answers to the questions parents ask most. The numbers are typical ranges; your child's cues come before the clock.
A wake window is the time your child is awake between two sleeps, including meals, play and diaper changes.
| Age | Wake window | Naps / day | Daytime sleep | Total sleep (24 h) |
|---|---|---|---|---|
| 9–12 months | 150–240 min (typically 195) | 2 | 2–3 h | 12–14 h |
| 12–18 months (a 15 month old) | 165–250 min (typically 210) | 2 (1–2) | 2–3 h | 11–14 h |
| 18–24 months | 240–330 min (typically 300) | 1 | 1.5–2.5 h | 11–14 h |
A 15 month old belongs in the middle row. The neighbouring rows are shown for context. The wake window ranges are the Whispie app's starting ranges, as on the wake window chart by age; they are not an official standard.
Free tool: Wake window calculator for a 15-month-old
How much does a 15 month old sleep?
Typically 11–14 hours in 24 hours, with 2–3 hours as daytime naps. The rest falls at night.
Outside sources agree: the WHO gives 11–14 hours of good quality sleep, including naps, for children aged 1–2 years, and the AASM consensus statement gives 11 to 14 hours per 24 hours including naps for ages 1 to 2 years.
These are ranges, not targets. If you are worried about sleep or unusual sleepiness, talk to your pediatrician or GP.
Wake windows at 15 months
The starting range is 165–250 minutes (about 3½ hours typical, for a two-nap day; on one nap the stretches are longer, around 4–5 hours), and meals, play and diaper changes count as part of it.
| What you see | What you can do |
|---|---|
| Rubbing eyes, yawning or going quiet earlier than expected | Aim for the lower end and start the nap routine. |
| Still cheerful and playing well near 5 hours | You can wait until the upper end. |
| Bedtime has become a struggle and your child seems overtired | Try making the last window of the day a little shorter. |
Long wake windows make falling asleep harder, not easier. Use the Wake Window Calculator to adjust for age.
One nap or two at 15 months
The Whispie app starts from 2 naps for 12–18 months and 1 nap for 18–24 months, and many children switch somewhere in between. Both patterns at 15 months are within the typical range.
- With one nap, the nap falls around the middle of the day and the wake windows are longer than the 165–250 minute range, around 4–5 hours.
- With two naps, the stretches between sleeps are shorter (165–250 minutes) because the day only has so many waking hours; follow your child's cues.
- Count the daytime total (2–3 hours), not just the number of naps.
- More on the topic: nap transition guide and dropping the nap.
Sample day for a 15 month old
This table is only an example of a one-nap day. The times move with when your child wakes, and your child's cues decide. The sample day starts at 7:00 am.
| Time | What happens | Note |
|---|---|---|
| 7:00 am | Day starts: breakfast | meals and play; about 5 h awake |
| 12:00 pm | Nap | about 2 h 15 min |
| 2:15 pm | Awake | about 4 h 45 min awake |
| 7:00 pm | Night sleep begins | Bedtime routine, then night sleep |
In this example the nap lasts 2 h 15 min, inside the typical 2–3 hours. The wake windows are 4 h 45 min and 5 h, which is what a one-nap day looks like (longer than the 165–250 minute range of a two-nap day). There is no fixed length for night sleep; the rest of the 11–14 hours falls at night.
Bedtime and night sleep at 15 months
There is no fixed length for night sleep, and there is no evidence-based number for night waking at this age. Our bedtime routine for toddlers, night wakings guide and early morning waking guide cover what to expect. For questions you cannot answer from the guides, talk to your pediatrician or GP.
Tired signs
Tired signs come before the clock. Our wake window chart suggests watching for early cues such as a staring look, a calmer body and yawning, and the chart's advice is to aim for the lower end of the range if your child is already fussy by the end of a wake window. More on the tired signs page.
Common questions about a 15 month old's sleep
How much sleep does a 15 month old need?
Typically 11–14 hours in 24 hours, with 2–3 hours of it as daytime naps. The WHO and the AASM both give 11–14 hours for children aged 1–2 years, naps included. These are ranges, not targets.
How long should wake windows be at 15 months?
The Whispie app starts a 15 month old from a range of 165–250 minutes (about 3½ hours typical), which assumes two naps; on a one-nap day the stretches between sleeps are longer, around 4–5 hours. If your child is fussy by the end of a window, aim for the lower end; if still cheerful, the upper end.
Does a 15 month old take one nap or two?
The Whispie app starts from 2 naps for 12–18 months, and many children move to one nap somewhere between 15 and 24 months, so both are within the typical range. On a two-nap day the stretches between sleeps are 165–250 minutes; on a one-nap day they are longer, around 4–5 hours. Judge by the whole day: daytime sleep of about 2–3 hours and how your child copes in the evening.
How long should a 15 month old nap?
About 2–3 hours of daytime sleep in total is typical, whether that is one nap or two. A single short nap is not a problem on its own; look at the total and your child's mood.
My 15 month old is fighting the nap. What should I do?
Check the day first: one or two naps, wake windows of 165–250 minutes (longer, around 4–5 hours, on a one-nap day) and 2–3 hours of daytime sleep. Our nap transition guide and the page on dropping a nap cover the topic in more depth. If sleep stays disrupted for a long time or you are worried, talk to your pediatrician or GP.
What changes at 18 months?
In the Whispie app's starting table, 18–24 months has wake windows of 240–330 minutes (4–5.5 hours) and 1 nap, with 11–14 hours of sleep in total.
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Previous ages: 12 month old sleep schedule · related: nap transition guide, bedtime routine for toddlers · all ages in the wake window chart by age.
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