Schedules by Age · Entry
21 Month Old Sleep Schedule: Naps, Wake Windows & Bedtime
A realistic 21 month old sleep schedule: one nap, wake windows, bedtime and a sample day, plus when to cap the nap and whether a 21 month regression exists.
A typical 21 month old sleep schedule is a one-nap day: wake around 7:00, nap from about 12:45 to 2:45, and lights out between 7:30 and 8:00. That puts roughly five and a half to six hours of awake time before the nap and a little over five after it. The CDC’s range for one- to two-year-olds is “11–14 hours (including naps)” in 24 hours, so a two-hour nap plus an eleven-hour night sits in the middle of it. The grid barely moves from 20 to 22 months. What changes at twenty-one months is that the nap and bedtime start competing for the same sleep.
A sample day at twenty-one months
| Time | Block |
|---|---|
| 7:00 | Wake + milk |
| 7:45 | Breakfast |
| 8:45 | Outside time |
| 10:00 | Snack |
| 10:30 | Play at home, errands or a class |
| 12:00 | Lunch |
| 12:30 | Wind-down: diaper, book, dark room |
| 12:45–2:45 | Nap |
| 3:15 | Snack |
| 3:45 | Outside time, round two |
| 5:30 | Dinner |
| 6:45 | Bath, pajamas, books |
| 7:30–8:00 | Lights out |
Slide the whole grid to match your child’s real wake time and keep the gaps. A toddler who wakes at 6:15 naps nearer 12:00 and is asleep by 7:00. If your day still looks like the 20 month old schedule, leave it alone. One month doesn’t require a new plan.
Wake windows at twenty-one months
| Typical at 21 months | |
|---|---|
| Awake before the nap | roughly 5½–6 hours |
| Nap length | roughly 1½–2 hours |
| Awake after the nap | roughly 5–5¾ hours |
| Night sleep | roughly 11–12 hours |
These are common patterns, not targets, and they sit between the windows in our 20-month and 22 month old sleep schedule entries. The check is how your child falls asleep. Asleep within 15 to 20 minutes at nap time and at bedtime means the windows fit. Half an hour of singing in the crib before the nap means the morning needs to be a little longer. Tears before lunch mean it needs to be shorter. For the wider picture, Betteroo keeps a chart of awake stretches from the newborn weeks to age three.
When to cap the nap
A long nap is welcome until it starts costing you the evening. The AAP’s sleep-hours page explains why the two are linked: the recommended ranges “reflect total sleep hours in a 24-hour period. So if your son or daughter still naps, you’ll need to take that into account.” A toddler has one daily total. Hours taken at 2:00 in the afternoon are not available at 8:00 at night.
The pattern to watch for is a bedtime that keeps sliding later while the nap grows.
| What you see for a week or more | What it suggests | What to change |
|---|---|---|
| Nap of 2½–3 hours, then awake and cheerful in bed until 8:45 or 9:00 | The nap is taking sleep from the night | Wake your child after 2 hours |
| Nap ends after 3:30, bedtime is a battle | The afternoon window is too short | End the nap by 3:00 |
| Long nap, 8:00 bedtime, easy settling, 7:00 wake | A child with high sleep needs | Nothing |
| Long nap after a bad night or during illness | Catch-up sleep | Nothing; let it run for a few days |
A few rules make the cap easier to live with:
- Cap by the clock, not by length. “Up by 3:00” is simpler to hold than counting minutes, and it protects the five hours before bed.
- Wake gently. Open the door, let in light and ordinary household noise, and give your child ten minutes to surface. A snack waiting helps.
- Trim in 15-minute steps. Shorten the nap by a quarter of an hour, hold it for three days, and look at bedtime before trimming again.
- Don’t cap a short night’s nap. If the night was broken, the nap is repair. Cap on ordinary days only.
Start the nap in a dark room with steady background sound so it begins on time. A fan-based sound machine like the Yogasleep Dohm covers the lunchtime noise of the rest of the house.
Cross-reference
When the nap and bedtime are pulling against each other
Betteroo builds a sleep plan for children from newborn to age 6 around your child's own wake time, nap and bedtime, and adjusts it as they grow.
Take the free 3-minute quiz →
Is there a 21 month sleep regression?
Not as its own event. “Sleep regression” is a parents’ word, not a clinical one, and no pediatric source we cite on this site describes a separate stage at twenty-one months. Sleep can still fall apart at this age, and there are three usual explanations.
- The 18-month one, running late. The things behind the 18 month sleep regression are separation anxiety, molars and a new taste for saying no. None of them arrive on a schedule. A child who sailed through eighteen months can meet them at twenty or twenty-one.
- A schedule that has been outgrown. A nap offered at 12:15 to a child who now needs 12:45 looks like nap refusal. A long nap that pushes bedtime to 9:00 looks like bedtime resistance. Check the windows and the nap cap first.
- A change in the day. A new daycare room, a new sibling, travel, illness or a burst of new words can all unsettle nights for a week or two.
The response is the same in each case. Keep the wake time, nap slot and bedtime where they were, keep the bedtime routine in the same order, give extra comfort without adding new sleep habits you’ll need to undo, and look again in two weeks.
Bedtime at twenty-one months
Most twenty-one-month-olds do well with lights out between 7:00 and 8:00, about five to five and three-quarter hours after the nap ends. The AAP recommends keeping “the same waking time (both on weekdays and weekends), mealtimes, nap time and play times” because it helps a child “feel secure and comfortable, and help with a smooth bedtime.”
Two adjustments cover most evenings. After a short nap or no nap, move bedtime 30 to 60 minutes earlier. After a capped nap, hold bedtime where it is for at least three nights before judging whether the cap worked.
When to check with your pediatrician
This entry describes typical patterns, not your child. Talk to your pediatrician if your toddler snores or breathes noisily most nights, seems exhausted despite enough time in bed, sleeps well under the 11 to 14 hour range and is struggling by day, or if a change in sleep comes with fever, ear pain or a drop in appetite. Bring a week of notes on wake time, nap and bedtime. None of this is medical advice.
FAQ: 21 month old sleep schedule
What is a good 21 month old sleep schedule?
One nap that starts five and a half to six hours after waking, and a bedtime a little over five hours after the nap ends. From a 7:00 wake that is a nap around 12:45 to 2:45 and lights out between 7:30 and 8:00.
How long should a 21 month old nap?
Commonly one and a half to two hours. A longer nap is fine if bedtime is still easy. If bedtime has drifted late, wake your child after two hours or by 3:00.
What time should a 21 month old go to bed?
Usually between 7:00 and 8:00. Go earlier after a short nap and for children who wake before 6:00.
How many naps does a 21 month old need?
One. Most toddlers have moved to a single afternoon nap well before this age and keep it past their second birthday.
Should I wake my 21 month old from a nap?
Yes, if the nap runs past 3:00 or longer than about two hours and bedtime is suffering. On days after a rough night, let the nap run.
