30 July 2026
The one suggestion Wriggler makes
Wriggler's whole design is to show you what you logged, not what to do. The wake-window guide is the one place it leans toward a suggestion, so here is exactly what it is and what it is built on.
Wriggler runs on a quiet idea. It shows you what you logged, and then it stops. Feeds counted, sleep timed, the hours since the last nap sitting there in plain numbers. It reflects your day back to you and leaves the reading of it where it belongs, with you.
There is one place it does a little more than reflect. A small ring on the home screen, and a short line that goes with it, where the app stops just short of a suggestion about when the next nap might fit. It is the exception to the whole design. So it is worth being plain about what it is, what it stands on, and where it deliberately goes quiet again.
The one place the app looks ahead
Most of the home screen is a mirror of the day so far. The wake-window ring is the part that looks a little way forward. It watches the time since your baby last slept, and as that time grows it fills toward the point where a nap tends to fit for a baby that age. When you are near it, a nudge appears the next time you open the app, a calm line rather than an alarm. It shows your baby's usual as something like "Usual ~1h 40m," and if a sleep timer is already running, it notices and holds its tongue.
This part is free. The ring and the nudge live in the core of the app next to the tracking, not behind the premium tier. Wriggler leads with the free thing on purpose, and the one suggestion it makes is one every parent gets.
It is worth saying what the nudge is not. It is not a countdown to a nap you are failing to start. It is not a score for how the day is going. It is a glance at the clock that Wriggler does for you, turned into a gentle "around now might suit," and nothing more insistent than that.
What the guide is built on
The age ranges under the ring are not something Wriggler invented. They are built on the age ranges from the Cleveland Clinic's medically reviewed wake-windows chart, and the source, the reviewing paediatrician, and the link are all cited in the app's own code. A newborn's range is not a six-month-old's; the chart knows that, and so the ring moves with your baby's age.
That is a deliberate line to stand on. The chart is a reputable starting range, not a verdict on your particular baby and not medical advice. Wriggler uses it the way you might use a rough sense of "babies this age often stay awake somewhere in this window," and then it gets out of the way. If you want to know what a wake window means for your own child, that is a conversation for you and the people who actually know your baby: your partner, your midwife, your GP, your paediatrician.
It learns your baby, inside the lines
A chart is a starting point. Your baby is the real thing. So the ring pays attention to what you have actually been logging.
Over the last twenty-eight days it reads your baby's real wake windows and finds the typical one, using the middle of the range rather than the extremes, so a single wild day does not throw it. It learns mornings and afternoons apart, because the gap before the first nap and the gap before the afternoon one are rarely the same. If you stop and restart the timer during one long nap, it treats that as one sleep, not two short ones, so a split entry does not quietly skew the picture. And it waits before it trusts your data: roughly ten observed windows before it starts leaning on them, closer to twenty before it fully does. Until then it leans on the chart.
Here is the part that matters most. However much it learns, the personal estimate stays inside the Cleveland Clinic range for your baby's age. It can nudge a little earlier or a little later within that band as it learns your baby's rhythm, but it will not wander outside it. And it aims at the later end of the range by design, so it never hurries you toward a nap. If anything it errs on the side of giving your baby room.
Where it stops
That is the whole of it. A range from a reviewed chart, gently shaped by your own last month of logging, shown as one calm line and one filling ring. No judgment about whether the nap was long enough or good enough. No opinion on how you are doing. The suggestion is about timing, and only timing, and even then it is a suggestion you are free to ignore completely.
Because the ring can be right about the clock and still be wrong about tonight. Your baby is teething, or overtired, or wide awake and delighted, and you can see it in front of you in a way no ring can. You know your baby. The guide is there for the foggy moments when you have lost track of the hours and would like a second pair of eyes on the clock. On the days you do not need it, you can let it fill and blink and mean nothing at all.
An app whose whole promise is "we show you what you logged, not what to do" has to be careful about the one place it says a little more. This is that place, in the open: built on a reviewed chart, tuned to your own baby, held inside the lines, and always yours to overrule.