Eighteen months is one nap, a long one, in the middle of the day — with five hours or more of awake time on either side of it. It is also the age of the most talked-about regression, and this one has an obvious cause: language, autonomy, and separation anxiety all arrive together, and bedtime is where they get tested.
Wake at 7:00 AM, 1 nap of about 1 h 30 min each, bedtime at 7:00 PM. Nap times are windows, not deadlines — anywhere inside one counts.
| Part of the day | Clock time | Notes |
|---|---|---|
| Wake | 7:00 AM | |
| Nap 1 | 12:00–1:30 PM | 5 h awake first |
| Bedtime | 7:00 PM | 5 h 30 min awake first |
The planner adjusts it to your baby's own wake time, bedtime, and birthday — including corrected age if your baby was born early.
The sample day above lands at 1.5 h of daytime sleep and 12 h overnight — 13.5 h in 24. A baby at the bottom of the range who wakes up happy is not short on sleep; the range is wide because babies are.
The single nap holds for another year or more. What usually needs adjusting at this age is the nap cap, not the nap count: a nap that runs past three hours starts eating into the night.
One nap of roughly 1–2.5 hours. If the nap is long and bedtime has become a battle, capping the nap is usually more effective than moving bedtime later.
A stretch of bedtime resistance and night waking that lines up with a developmental leap — language, independence, and separation anxiety. It is a phase with a cause, not a schedule problem, and holding the boundaries is usually what ends it.
Roughly five to six hours after the nap ends, which for a midday nap puts bedtime in the usual 7–8pm window. If the nap ends late, bedtime moves — that is arithmetic, not stubbornness.
Tier 1 — evidence-based The ranges on this page are the consensus sleep totals and nap counts below. The phrase "wake window" itself is a Tier 2 practice-based heuristic: it does not appear in the pediatric sleep-medicine literature, so treat the window lengths as a starting estimate and let your baby's sleepy cues override them.