15 months old sleep schedule

Updated 2026-08-22 · Source: AASM (AAP-endorsed) · Free · No sign-up

TOTAL SLEEP PER 24 HOURS

11–14 hours

Published by the American Academy of Sleep Medicine and endorsed by the AAP, including naps. This is the part of any sleep schedule that is actually guidance.

AASMAAP-endorsed

Convention, not guidance. The nap count and wake windows below are not published by any medical body. Which parts of a sleep schedule are actually published →

A sample day at 15 months

Built from a 7:00am wake-up. Change the wake time in the tool to shift the whole day.

7:00am

Wake for the day — your input

11:30am – 1:15pm

Nap 1 — 4h 30m awake, then about 1h 45m asleep

5:45pm

Bedtime — 4h 30m after the last nap ended

Each nap starts one wake window (4h 30m) after the last sleep ended; bedtime is one more after the final nap. Nap length is assumed at about 1h 45m.

Build this from your own baby's wake time →

What is typical at 15 months

The two-to-one nap transition usually lands somewhere in here. It tends to be gradual and messy rather than a clean switch.

Naps at this age: 1–2. Awake between sleeps: 4h to 5h. Longest night stretch: 10–12 hours at a time.

What most babies are doing at 15 months

The CDC publishes a milestone checkpoint at exactly this age. These are the things 75% or more of children can do by 15 months.

Social and emotional

Copies other children while playing
Shows you an object they like
Claps when excited
Shows affection (hugs, cuddles)

Language

Tries to say one or two words besides "mama"/"dada"
Looks at a familiar object when you name it
Points to ask for something or get help

Learning and problem-solving

Tries to use things the right way (phone, cup, book)
Stacks at least two small objects

Movement

Takes a few steps on their own
Uses fingers to feed self

The CDC does not link these milestones to sleep, and neither do we. They are here because much of what changes about sleep at a given age is really what is changing about the baby. Source: CDC, Learn the Signs. Act Early.

Safe sleep, source conflicts and what this is not — the AAP safe-sleep rules, where the AASM and the National Sleep Foundation disagree, and why this is not a sleep-training method: read the full guidance notes. General guidance, not medical advice.

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FAQ

How much should a 15 months old sleep?

11–14 hours per 24 hours including naps, per the American Academy of Sleep Medicine, endorsed by the AAP.

How many naps at 15 months?

1–2 is the conventional range at this age. No medical body publishes nap counts — this is convention, and healthy babies fall outside it.

What are wake windows at 15 months?

Conventionally 4h to 5h awake between sleeps. Wake windows are not published guidance from any medical body, whatever a schedule page implies.