30 July 2026
How Wriggler's wake predictions use your sleep log
Sleep tracking is free. Premium adds a wake prediction shaped by recent sleep records, with clear limits when there is not enough information to make a useful estimate.
A sleep log answers a straightforward question: when did the baby sleep? Wriggler's free tracker keeps those starts and finishes, whether you use the timer or add a sleep afterwards.
Premium adds a different view. The wake card uses the last completed sleep and recent records to estimate when another sleep might fit. It is a guide to timing, not a requirement to put your baby down.
Recent records matter more
The current prediction looks back over fourteen days. It gives more weight to recent records and wake times at a similar time of day, using the family's time zone.
Before it learns a personal pattern, it needs enough usable windows across several days, including recent observations near the current wake time. Brief resettles and overlapping sleep entries are combined so they do not become artificial wake windows.
These are choices about how the software handles a log. They are not clinical measures of how much sleep a child needs.
Age guidance has a boundary
During the first year, Wriggler uses age ranges from Cleveland Clinic as a starting point and keeps the personal estimate within that range. Beyond the first year, it uses a recent logged pattern when there is enough suitable history; it does not extend those infant ranges into toddler guidance.
If there is no usable personal pattern, a baby within the supported infant age range can still have an estimate from the age guidance. An older child needs sufficient logged history. When the information is missing or unsuitable, the card can show that a prediction is unavailable instead of manufacturing a time.
The timer stays free
Starting a nap, stopping the timer and reading your sleep records do not require Premium. Wake predictions are part of Premium, alongside optional AI insights, PDF export and caregiver sharing.
The first version of this article called wake predictions free and described an older learning method. This version reflects the app prepared for launch in September.
Whatever the estimate says, you are the one with your baby in front of you. Questions about their sleep or health belong with your child health nurse or GP. A prediction from a log cannot answer those questions.
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