How much sleep does a 15-month-old need?

Between 11 and 14 hours in 24 hours. Most 15-month-olds sleep 10–12 hours at night and nap 1–2 hours during the day. Children who have recently completed the 2-to-1 transition may be at the lower end of this range as the system recalibrates.

How many naps should a 15-month-old have?

One. The 2-to-1 nap transition typically completes between 13 and 18 months — 15 months is right in the middle of this window. A 15-month-old still on 2 naps may be ready to transition if the second nap is consistently refused or bedtime is pushing past 8pm. A 15-month-old on 1 nap who seems overtired is likely still in the transition adjustment period.

What time should a 15-month-old nap?

Midday — between 11:30am and 12:30pm depending on wake time. A child waking at 6:30am should nap by 12:00–12:30pm. The nap should end by 2:30–3:00pm to protect bedtime. A nap ending after 3pm will push bedtime past 7:30pm for most children, which can produce early morning waking.

My 15-month-old fights the nap every day. Should I drop it?

Not yet. Fighting the nap at 15 months is almost always the autonomy drive rather than genuine readiness to drop. The test: does the child fall apart in the late afternoon or early evening on nap-miss days? If yes, the nap is still needed. Maintain the offer consistently at the same time every day. Most children who are genuinely ready to drop the nap are 2.5–3 years old.

What wake windows should a 15-month-old have?

Between 5 and 6 hours. A child waking at 6:30am should nap around 11:30am–12:00pm (5–5.5 hours after waking). The afternoon wake window (from end of nap to bedtime) is typically 5–6 hours. A child whose nap ends at 1:30pm should be asleep by 7:00–7:30pm.

Is there a 15-month sleep regression?

There is not a universally recognised regression at exactly 15 months. The disruption most parents experience around this age is one of two things: the 2-to-1 nap transition creating schedule instability (which lasts 4–8 weeks), or the early edge of the 18-month regression for children who hit milestones slightly early. Both resolve with consistent routine maintenance.

What time should a 15-month-old go to bed?

Between 18:30 and 19:30. The wake window from end of nap to bedtime should be 5–6 hours. If the nap ends at 13:30, target bedtime at 18:30–19:00. If the nap ends at 14:00, bedtime at 19:00–19:30 is appropriate. A 15-month-old who is not asleep by 19:30 is likely overtired — earlier is usually better at this age.

My 15-month-old's sleep was fine on two naps but has deteriorated since dropping to one. Is this normal?

Yes — the 2-to-1 nap transition takes 4–8 weeks to stabilise as the sleep system recalibrates. The child's total sleep pressure builds differently on a 1-nap schedule and bedtime settling is often harder during the adjustment period. Keep bedtime 30 minutes earlier than pre-transition for the first 4–8 weeks, ensure the nap is consistently at midday and ends by 2:30pm, and most families see the pattern stabilise within 6–8 weeks.

14–16 months

15 months

How much sleep, how many naps, what bedtime — and what's normal at this stage.

Total sleep

11–14 hrs

Night sleep

10–12 hrs

Naps

1 nap · 1–2 hrs

Bedtime

18:30–19:30

Sample 15 months schedule

Time	Activity
06:30	Wake
07:00	Breakfast
12:00	Nap (1–2 hrs)
13:30	Wake from nap
18:30	Bedtime routine
19:00	Asleep

All times are approximate. Adjust by 30–60 minutes to suit your child.

What's normal at 15 months

•One nap — the 2-to-1 transition has completed or is completing
•Wake windows of 5–6 hours
•Language explosion beginning — first words multiplying rapidly
•Walking is well-established — motor sleep disruption is typically behind them
•Separation anxiety still present — less acute than at 9 months but still a bedtime factor
•The 18-month regression is approaching for babies at the later end of this range
•Strong routine awareness — protests any deviation from the expected sequence

What changed since 12–13 months

•The 2-to-1 nap transition has completed — the baby is now on a single midday nap
•Wake windows have approximately doubled from the 2-nap schedule — 5–6 hours vs 3–4 hours
•Walking is fully established — motor-related sleep disruption from this milestone is typically resolved
•Language is exploding — the child understands significantly more than they can say, which is beginning to produce frustration
•The schedule has become more toddler-like — mealtimes anchor the day more than nap timing

What's coming next

The 18-month regression is the next significant disruption for most children at this age, typically hitting between 17 and 21 months. It is driven by the language explosion and the first major autonomy drive. Separation anxiety will peak again at 18 months before gradually reducing through the toddler years.

2-to-1 nap transition (if recent)

Typically 13–18 months

The 2-to-1 nap transition itself produces a 4–8 week period of schedule instability as the child's sleep system recalibrates. During this transition the child is overtired on a 1-nap day and undertired on a 2-nap day. Bedtime resistance and night waking increase until the new pattern consolidates. Moving the nap to midday (rather than morning) accelerates the consolidation.

Full guide: 18-month sleep regression →Full reset guide →

Common challenges at 15 months

Nap transition instability

If the 2-to-1 transition has recently completed, the schedule may still be calibrating. Some days the child seems overtired from one nap; other days the nap is too long and disrupts bedtime. Target a consistent midday nap start (11:30am–12:30pm depending on wake time) and cap at 2 hours to protect bedtime. Pull bedtime earlier by 30 minutes for 4–8 weeks after the transition completes until the rhythm stabilises.

Bedtime resistance increasing

At 15 months, bedtime resistance is increasing as the autonomy drive emerges. The child has enough language to express a preference and enough motor ability to act on it. A consistent routine sequence (20–25 minutes, same order every night) ending with the same goodbye phrase gives the child a predictable endpoint. The goodbye phrase is the signal that the interaction is ending — it is not an opening for negotiation.

Early waking after the nap transition

Early rising is common in the weeks after the 2-to-1 nap transition as the child's sleep pressure recalibrates. The child is accumulating more wake time before the single nap, which can produce early morning waking as the night period adjusts. Moving bedtime earlier by 20–30 minutes and ensuring the nap ends by 2:30pm typically resolves early waking within 2–3 weeks of the transition.

Nap refusal on some days

At 15 months nap refusal on occasional days is normal — the autonomy drive is beginning to express itself. Unlike at 18 months (where refusal is more consistent), 15-month nap refusal is typically situational. Maintain the offer consistently: same time, same cot, same routine. On nap-miss days, pull bedtime 30–45 minutes earlier. Do not drop the nap — most children need it until 2.5–3 years.

Something disrupted sleep?

The 2-to-1 nap transition often breaks routines that were working. If sleep has deteriorated since the transition, Nora Live diagnoses the pattern and builds the adjusted plan. If a routine was never fully established, the Pack gives you the right structure for the 1-nap schedule.

Talk to Nora — $99 →

Build your 15 months routine

Or build a foundational routine to prevent the pattern from re-emerging.

Build my routine — $45 →

Related guides

Questions about 15 months sleep

Methodology grounded in paediatric sleep research and evidence-based clinical practice. Schedule data, wake window recommendations, and regression timelines are derived from published guidelines including those of the American Academy of Sleep Medicine (AASM), the National Sleep Foundation, and paediatric sleep research published in peer-reviewed journals.

Read our full methodology →