How much should a 15-month-old sleep?

Eleven to 14 hours in 24, with 10 to 12 hours at night and 1 to 2 naps. Wake windows run 3.5 to 4.5 hours. By 15 months most of the total sits in the night, and the nap tops your toddler up rather than carrying a major share. If your toddler is well below the range week after week, mention it at the next pediatric visit.

How long should a 15-month-old's nap be?

Somewhere around an hour and a half to two hours is common once the single nap has consolidated, but the useful test is the afternoon: if your toddler gets to bedtime without falling apart, the nap did its job. A nap that regularly runs under an hour usually needs a darker room, a more consistent start time, or a slightly longer wake window before it.

My toddler still fights the switch to one nap. Is that normal?

Yes. The 2-to-1 transition frequently takes four to eight weeks and rarely goes in a straight line. Days when two naps are clearly needed are part of it, not a step backward. Keep the single nap at a consistent time on the days it works, use an earlier bedtime on the days it does not, and let your toddler's tolerance for a long afternoon set the pace.

Can teething explain weeks of bad nights?

Rarely. Molars can make a couple of nights around eruption genuinely uncomfortable, but teething does not usually cause weeks of disrupted sleep. If broken nights have gone on longer, look at nap timing, the last wake window and the room first. For pain that seems more than mild, or any fever, speak to your pediatrician rather than using teething gels.

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Baby sleep schedule at 15 months: settling into one nap

At 15 months your toddler needs 11 to 14 hours of sleep a day — 10 to 12 at night, plus 1 to 2 naps. The short end of the wake window has moved up, so your toddler now goes 3.5 to 4.5 hours between sleeps, which is the practical sign that the two-nap day is running out of room.

For most families this is the month the single nap stops being an experiment. A nap around the middle of the day, roughly two hours long, with a long stretch of awake time on either side, becomes the default. Some toddlers still need a second short nap on rough days, and that is fine.

11–14 h

Total sleep / 24 h

10–12 h

Night sleep

1–2

Naps per day

3½ h–4½ h

Wake window

If the transition is still in progress, the last piece is usually nap length. A single nap that runs 45 minutes can't cover an afternoon of four hours, so the nap has to grow before the day stabilizes. Keeping it at a consistent time, in a dark room, with a short predictable lead-in, is what helps it stretch. Early bedtimes remain the safety valve while it does.

The first molars often arrive between 13 and 19 months and can make a few nights uncomfortable. Real teething pain is short-lived, though — a couple of days around eruption, not weeks — so if broken nights persist, look at nap timing and the length of the last wake window before blaming teeth. Anything that looks like more than mild discomfort belongs with your pediatrician.

A sample day

This is a one-nap day at 15 months: a long nap after lunch with wake windows of 3.5 to 4.5 hours on either side. Treat the times as a starting point, and on a day when the nap is short, bringing bedtime forward is a better response than holding the times below.

Time	What happens
7:00	Wake-up and first feed
12:30	Nap 1 · approx. 120 min
19:45	Bedtime routine and lights out

A sample day to give you a rough idea — every baby is different. Adjust the times to your child's sleep cues, and talk to your pediatrician about anything that worries you.

Does this 15 months schedule match your day?

Lulla times the naps and tells you when the wake window is closing, so you do not have to keep count in your head.

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Tips for this age

Aim for the nap to start at roughly the same time daily, because consistency does more for nap length at this age than anything else.
Keep the nap room as dark as the night room; a bright room caps a midday nap at one sleep cycle.
Lulla's history shows how nap length is trending week to week, which tells you whether the single nap is really consolidating or just having a good day.
Cap the nap if it starts running past mid-afternoon, so there is still time to build sleep pressure before the night.
Bring persistent night waking, snoring or anything about your toddler's breathing to the 15-month check-up.

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Common questions

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Sources

The figures on this page follow the guidance of these organizations. This information is educational and does not replace advice from your pediatrician.