How SleepSense Works
A clear look at how SleepSense predicts sleep and adapts to your baby
How SleepSense learns your baby's rhythm
Every baby has a different sleep rhythm. SleepSense starts with age references, then pays attention to the sleep you log.
Start with age guidance
With little sleep history, SleepSense uses age-based reference ranges and today's logs to estimate the next nap. After the newborn weeks, it can also suggest bedtime. These are starting points, not a fixed timetable.
Want to see the age reference numbers? They're in these guides:
Learn your baby's rhythm
After at least five days of sleep logs, SleepSense looks for usual wake windows, nap lengths, nap count and bedtime. When those patterns are consistent, they carry more weight in the plan.
Adjust as the day unfolds
Each new sleep log can change what comes next. SleepSense can move later naps and bedtime suggestions when today's sleep differs from the usual pattern.
A day in practice
If your baby usually takes the first nap earlier than an age guide suggests, SleepSense can bring that nap forward. If the nap lasts longer than usual today, the rest of the plan can shift too.
What shapes the timing
Time of day
When a suggestion still relies on age guidance, SleepSense can account for the time of day. A reliable personal wake-window pattern already reflects when your baby tends to sleep, so the app does not add the same adjustment again.
Bedtime and short naps
Your preferred bedtime helps guide the plan. If a full late nap would leave little room before bed, SleepSense may suggest a shorter nap. Bedtime is a target, and the suggestion can move when the day changes.
Corrected Age for Premature Babies
If your baby was born before the due date you entered, SleepSense uses corrected age for its age-based references until your baby is two years old. Logged sleep patterns still matter.
How sure is the plan?
When SleepSense has an adaptive day plan, it may show an overall confidence level based on the sleep history available. Early estimates can rely on age guidance while the app is learning. A prediction is a suggestion, not a promise about when your baby will fall asleep.
Research on baby sleep
The sources below cover sleep duration, nap patterns and differences between babies. For age-based wake-window ranges, see the guides above. These sources don't provide a formula for predicting your baby's next nap:
Let SleepSense learn your baby's rhythm
Log sleep in nappi to see nap and bedtime suggestions respond to your baby's day. SleepSense starts with a free preview; ongoing access is part of Premium.