Going from two naps to one is the longest and least tidy of the nap transitions. It takes weeks rather than days, it goes backwards in the middle, and it is very commonly started two or three months too early because of a fortnight of nap refusal that would have passed on its own.
When it really happens
A single afternoon nap is established somewhere between fifteen and twenty-four months in the cohort data.[1] Most children make the move between thirteen and eighteen months. Before twelve months it is rare, and a twelve-month-old refusing the morning nap for a week is far more likely to be doing something else.
15–24 months
The twelve-month false alarm
Around eleven to thirteen months there is a well-known stretch where the morning nap is fought or refused, often alongside a burst of walking practice and a run of early waking. Families read it as the transition, drop to one nap, and end up with an overtired toddler and a 5am start. The tell is that a true transition arrives slowly and stays; a false alarm ends in one to two weeks and the morning nap comes back on its own.
The signs that mean it is real
- The morning nap is refused, or taken and then the afternoon nap is refused — for two or three weeks, not one.
- Taking both naps pushes bedtime past 8pm, and your toddler is still not tired at it.
- The morning nap has drifted later and later on its own, towards late morning.
- Night sleep is fragmenting or early waking has appeared with no other explanation.
How to make the move
Move the morning nap, don't delete it. Expect four to six weeks.
- 1
Push the morning nap later in small steps
15 minutes every two or three days. You are aiming to land the single nap somewhere around 11:30 to 12:30, after an early lunch.
- 2
Bring lunch forward
A toddler cannot make it to a 12:30 nap on a 12:30 lunch. Eat at 11:15–11:30 during the shift, then move it later again once the nap settles.
- 3
Let some days have two naps
Alternating between one-nap and two-nap days for a few weeks is the transition, not a failure of it. Follow the day you are actually having.
- 4
Protect an early bedtime
17:45–18:30 is normal on one-nap days during the shift. Bedtime moves back later once the single nap lengthens.
- 5
Aim for a nap of about two hours
Once it settles, a single nap of roughly two hours is the pattern seen through the toddler and preschool years. A 45-minute single nap means the day is not there yet.
Before and after
| On two naps | Mid-transition | On one nap | |
|---|---|---|---|
| Wake | 06:45 | 06:45 | 06:45 |
| Nap 1 | 09:30–10:15 | 10:30–11:15 | — |
| Lunch | 12:00 | 11:15 | 11:30 |
| Nap 2 | 13:30–14:45 | — (or short) | 12:00–14:00 |
| Bedtime | 19:30 | 18:15–18:45 | 19:15 |
The single nap is doing the work of two, so the windows around it get long — around five hours before and five or more after. That is the point at which wake window stacking stops being a nice idea and becomes the thing holding the day up, and the wake window calculator is quicker than doing it on paper each morning.
How long it takes
Four to six weeks is typical, and it is normal for weeks two and three to look worse than week one. If you are still alternating after two months, or your toddler is clearly exhausted every afternoon, the honest move is to go back to two naps for a few weeks and try again — nothing is lost by doing that.
What to measure while it is messy
Total sleep, not nap count. The AASM consensus recommends 11–14 hours per 24 hours for one- to two-year-olds, including naps.[3] Total sleep is falling steadily across this period anyway — reference curves show the decline continuing right through the second year[2] — so a transition that lands your toddler in that range with a settled bedtime has worked, even if the schedule never looks like anyone else's.[5]
As with everything about napping, the evidence base is descriptive: a systematic review of napping from birth to five years found only observational studies, all rated low quality.[4] Ages and durations here are what large groups of children have done, not what a trial has shown to be best — the toddler in front of you is the better source.
