18-month-old sleep schedule
How much does a baby sleep at 18 months, how many naps are usual and how long is it awake in between? Guideline values with sources and an example day – not a plan to follow.
At a glance
| Sleep per 24 hours | 11–14 hr |
|---|---|
| Night | 11 hr |
| Naps | 1 nap |
| Awake time in between | 5 hr – 5 hr 30 min |
Sleep in 24 hours: consensus of the American sleep physicians (AASM, Paruthi 2016) – a value for groups, not for an individual child.
Night: this is what Moon Hour starts out with and then learns your child’s night length.
An example day
This is how Moon Hour might calculate on the first day if a child at 18 months wakes at 7 am and has no entries yet. It is an example, not a plan to follow: children are different, and the app adjusts the times to your child with every entry. Sleep schedule calculator: an example day for your wake-up time
Sleep schedule as a printable PDF (A4)
| Time | What |
|---|---|
| 7:00 AM | Waking up |
| 12:00 PM – 2:00 PM | Nap 1 |
| 7:30 PM | To bed for the night |
What often changes at 18 months
At a year and a half, 96% of the children in the Zurich longitudinal study still slept during the day (Iglowstein 2003). In a large analysis of app data, children at 18 months took on average one nap and slept about 12.5 hours in 24 hours in total (Paavonen 2026).
If you are worried
Experts recommend contacting your paediatrician or your local out-of-hours medical service if you are worried.
Sources
- Paruthi et al. 2016: Recommended amount of sleep for children (AASM consensus)
- Iglowstein et al. 2003: Sleep duration from infancy to adolescence (Zurich longitudinal study)
- Paavonen and de Bie 2026: Sleep from 3 to 18 months in app data from over 175,000 babies
- Canapari: Wake windows – what a sleep physician says about them
General information, not a substitute for medical advice.
Sources checked: November 2026