How much sleep does an 18-month-old need?

The AAP and CDC recommend 11–14 hours in 24 hours through age 2, which is also the National Sleep Foundation range. An 18-month-old usually gets 10–12 hours at night plus a 1.5–2 hour nap.

What wake window does an 18-month-old need?

About 5–5.5 hours before the nap and 5–5.5 hours after it. At this age the two windows even out, so the same nap time daily keeps bedtime from drifting.

Why is my 18-month-old waking at night suddenly?

That pattern is the 18-month regression: separation anxiety plus rapid skill gains interrupts sleep. Respond briefly and boringly, keep the night dark and boring, and hold the schedule — most families see it settle within 3–6 weeks.

Is there a sleep regression coming for an 18-month-old?

The 18-month window may be arriving now, and after it the next classic one is the 2-year sleep regression between 24 and 30 months. Both respond best to a steady schedule and brief, consistent responses.

Monthly schedule · 18 months

18-Month-Old Sleep Schedule

Here is a realistic day for a 18-month-old: wake up around 7:00 AM, one nap at 12:30 PM, then bedtime around 7:30 PM. Wake windows run 5 to 5.5 hours, and total sleep lands near 11 to 14 hours. Shift any time 15 to 30 minutes to fit your family, consistency beats the exact minute.

Not medical advice. Typical ranges, not targets — ask your pediatrician about your child.

A sample day for a 18-month-old

Wake up

7:00 AM

Nap

5.5 hours awake

12:30 – 2:30 PM

Bedtime

5 hours after the nap

7:30 – 8:00 PM

Wake windows: 5 – 5.5 hours

1 nap

11 – 14 hours (10 – 12 at night + 1 nap)

What’s changing at 18 months

The 18-month regression window (separation anxiety, walking, language bursts) hits many toddlers now: sudden night wakes, split nights and nap refusal. It usually passes in 3–6 weeks without dropping the nap.

Frequently asked questions

How much sleep does an 18-month-old need?: The AAP and CDC recommend 11–14 hours in 24 hours through age 2, which is also the National Sleep Foundation range. An 18-month-old usually gets 10–12 hours at night plus a 1.5–2 hour nap.
What wake window does an 18-month-old need?: About 5–5.5 hours before the nap and 5–5.5 hours after it. At this age the two windows even out, so the same nap time daily keeps bedtime from drifting.
Why is my 18-month-old waking at night suddenly?: That pattern is the 18-month regression: separation anxiety plus rapid skill gains interrupts sleep. Respond briefly and boringly, keep the night dark and boring, and hold the schedule — most families see it settle within 3–6 weeks.
Is there a sleep regression coming for an 18-month-old?: The 18-month window may be arriving now, and after it the next classic one is the 2-year sleep regression between 24 and 30 months. Both respond best to a steady schedule and brief, consistent responses.

Sources: American Academy of Pediatrics (AAP) and CDC sleep guidance for toddlers, plus National Sleep Foundation (NSF) ranges for children aged 1–3. Not medical advice — these are typical ranges, not targets. If you have questions about your child’s sleep or development, ask your pediatrician.