Wake windows by age: the cheat sheet

Every parent learns the same lesson in the same way: keep the baby up too long and the settle gets loud. The wake window, the stretch between one sleep and the next, is the mechanism behind most easy nights and most hard ones. This is the cheat sheet version: the ranges, the cues, and what a missed window really costs.

What is a wake window?

A wake window runs from the moment your baby wakes to the moment you put them down again, with feeding, playing, and the wind-down all included. Babies build sleep pressure while awake. A window that is too short means not enough pressure to settle, and one that is too long tips into overtired, where settling gets paradoxically harder.

The skill is not hitting a number. It is starting the wind-down while the window is still comfortably open.

How long should wake windows be?

Ranges, not rules, and the spread widens with age:

Two honest caveats. First, the last window of the day is usually the longest and the first is usually the shortest. Second, these are population averages drawn from observational sleep research. Your baby is one data point, and reliably individual. Treat the table as the place to start watching, not the verdict.

Which cues mean the window is closing?

The early cues are subtler than most lists suggest: a settling gaze into the middle distance, slowing play, losing interest in the toy that worked five minutes ago, a first ear or eye rub. Yawning is already the middle of the story. Fussing, arching, and the frantic second wind are the end of it. By then the window has closed.

The practical rule: when the table says you are near the range and you see one early cue, begin the wind-down. Acting on the first cue beats waiting for confirmation.

What does a missed window actually cost?

Less than the internet says. An overshot window typically buys you one harder settle, possibly a shortened nap after it, and a slightly crankier hour. It does not, by itself, wreck the night or the week.

The recovery is boring and effective: shorten the next window by 15–20 minutes, protect the wind-down, and let the day re-balance. Chasing a bad morning with schedule surgery usually costs more than the missed window did.

How tiho reads your windows

tiho measures wake windows from what you actually log, wake-ups and put-downs, and holds them against your baby’s own recent pattern rather than just the age baseline. When the next window is closing, the app tells you before the cues get loud. On the Behavioral method the suggestion leans toward the steady schedule. On Responsive it moves with the day you are actually having. Either way, the table above is built into the app so you never have to memorize it.