Baby wake windows: why we show tiredness cues instead of a chart

What baby wake windows are

"Wake window" is the name for the time a baby spends awake between waking up and falling asleep again. That is all it means. The phrase describes something you can observe, not a fixed timetable.

Baby wake windows are a popular idea online, but the NHS pages we rely on here do not use the term and do not publish wake-window times by age. What they describe instead are the signs that a baby is getting tired, and they say clearly that babies differ.

Why there is no wake windows by age chart here

There are many charts online with minutes for each month of age. At best they describe averages. The NHS is direct about this: some babies need more sleep, some less, every baby is different, so try not to compare yours with others. Your baby will have their own pattern of waking and sleeping, and it is unlikely to match other babies you know.

The rhythm also changes as your baby grows. In the early weeks babies cannot yet tell night from day; that develops gradually. The NHS notes that it can feel as though every time you have settled into a routine, it changes again. A number that fits today may no longer fit in a fortnight.

And a fixed chart creates pressure. If you are watching the clock, you are watching your baby less. So we deliberately leave out the minutes, even though a search for a wake windows chart might lead you to expect them.

Baby tiredness cues: how do I know when my baby is tired?

Most babies show you when they are getting tired. An NHS leaflet on baby sleep from Wirral Community Health and Care NHS Foundation Trust lists these signs. Your baby may:

• yawn;
• rub their eyes or pull at their ears;
• become quieter, or less engaged and responsive;
• frown, or pull at their hair;
• have a glazed look or drooping eyes;
• want to suck or feed;
• arch backwards.

The same leaflet explains that becoming irritable and beginning to cry are late signs, and can lead to a baby becoming overtired. That is why the early cues are worth a look: settling a baby tends to be easier before the crying starts.

The NHS Best Start in Life pages add a related set of signals that a baby needs a break: turning away, closing their eyes, yawning, sneezing, hiccupping or bringing up a little milk. When you see them, the NHS suggests slowing the pace, stopping the activity, or moving to a quieter place.

Not every baby shows tiredness clearly, and the cues change as babies grow. The NHS leaflet says cues vary from baby to baby, and that you will begin to recognise your own baby's over time. The American Academy of Pediatrics says the same on HealthyChildren.org: the signs become easier to spot as you get to know your baby.

Rhythms differ, and they change

As babies get older, they can usually stay awake for longer. Fixed minutes still rarely fit, because the range between two babies of the same age is wide. Noting down for a while when your baby sleeps and wakes often shows you your own pattern more clearly than any general chart.

Longer awake times do not need a programme either. A blanket on the floor, a quiet spot near you and the occasional change of scene in the room are often enough. In the first weeks, awake rarely means long at a stretch, and it is almost never predictable.

How the Sleep World in Heia helps

In Heia the sleep area is called the Sleep World. It suggests a time range for the next sleep, for example "Probably 1:20–1:50 pm". That is a range, not a target. If your baby seems tired, your baby counts, not the card.

What the suggestion is based on

• Starting point: the last time your baby woke up and your baby's age. The age range is a rough guide, not a rule.
• Your own entries: once enough awake times between daytime naps have been logged and a steady rhythm shows, the Sleep World carefully adjusts the range to it. It looks at your sleep entries from the last 30 days.
• Caution built in: if your rhythm is shifting a lot right now, or it is the first awake time of the day, Heia stays with the age range. Any adjustment stays within the same limit you can also set by hand.
• Only your data: entries from other families are never used. The calculation happens on your device.

While a sleep is running, Heia suggests no range. And if no daytime nap has been logged for a while, Heia does not suggest one either.

Sleep settings

In Sleep settings you can move the range earlier or later for each child, for babies who stay awake longer or tire sooner. There you can also turn on a quiet hint if you like: no sound, and never at night. You can read more about how quiet Heia stays at night under night mode.

The Sleep World and its suggestion for the next sleep window are free. Heia Plus adds a more detailed explanation: whether a suggestion is based on age or on your entries, how many awake times have been measured, and why Heia is not (yet) adjusting to your entries. Plus also brings the day and night plan: Heia plans the rest of the day ahead, with every nap, the next feeds and bedtime, and at night the next likely feed, with a gentle reminder before every sleep. The plan is always based on age guide values blended with your own rhythm. It is guidance, not a fixed schedule, and there are no notifications at night. The suggestion for the next sleep window stays free.

If you track together, you all see the same state, even if someone else did the night shift. More under shared baby tracker.

Frequently asked questions