Estimate your baby’s next sleep based on their age and last wake-up time. Free, instant, and no sign-up required.
The clock time is the last wake time plus the wake window published for that age and that sleep. A first nap and bedtime on the same day do not share one window. Later sleeps usually use a longer one, which is why you pick the next sleep instead of getting a single number for the whole day.
The windows are the same ranges as the baby sleep guide, compiled from AAP, NHS, and Sleep Foundation guidance. For a newborn, sleepy cues matter more than the clock. See the newborn sleep schedule.
This is a typical range. Napple, the baby sleep tracker, learns the sleeps you log and predicts the next window for this baby.
It adds the published wake window for that age and that nap or bedtime to the time your baby last woke. It uses the ranges already in the baby sleep guide. It does not work out a new wake window.
Wake windows usually lengthen through the day. The window before the first nap is shorter than the window before bedtime. Choose the sleep that is actually next.
Use it as a planning range. Babies run short, run long, and change during a nap transition. Sleepy cues still matter, especially in the early months. The baby sleep guide explains the ranges by age.
This page applies a typical window for the age. Napple, the baby sleep tracker, predicts the next sleep from your baby’s own logged sleeps, and keeps both parents on the same schedule.
Medical Disclaimer: This tool provides general reference information compiled from pediatric sleep guidelines (AAP, Sleep Foundation, NHS). Every baby develops differently. These are typical ranges, not prescriptive targets. Always consult your pediatrician for questions about your baby's feeding, growth, health, or sleep concerns. Follow safe sleep guidelines: place babies on their back on a firm, flat surface with no loose bedding.