Baby won't sleep
What's behind the witching hour and how evenings get calmer.
Understanding sleep
Wake windows: how long your baby should really be awake
Your baby was clearly tired, but instead of drifting off they got more and more wired? That's a missed wake window. Here's what's behind it, and how to catch the moment without living by a stopwatch.
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The chart
Wake windows by age
A wake window is the stretch of time your baby can stay awake and content between two sleeps. Push past it and tiredness flips into overtiredness, and falling asleep turns into a fight.
You've probably seen a chart like this before. So here's the part the charts usually skip: these numbers are ballpark figures, not rules. Every baby is different, and the same baby is allowed to be different every day. Treat the chart as a compass, not a timetable.
| Age | Wake window | Naps per day |
|---|---|---|
| Newborn (0-6 wks) | 35-60 min | 6-8 |
| 2-3 months | 60-90 min | 4-5 |
| 4-5 months | 75-120 min | 3-4 |
| 6-8 months | 2-3 hrs | 2-3 |
| 9-12 months | 2.5-3.5 hrs | 2 |
| 12-18 months | 3-4.5 hrs | 1-2 |
| 18-24 months | 5-6 hrs | 1 |
Wake windows are shortest right after waking up and longest before night sleep. The first window of the day is almost always the tightest one.
The actual trick
Read your baby, not just the clock
Here's the reframe that makes wake windows useful instead of stressful: your baby is the source, the clock is the backup. These early tired cues show up before the fussing starts:
- Their gaze goes glassy or drifts into the distance
- They rub their eyes, ears or nose
- Movements get jerky, frustration comes faster
- A first yawn, red-rimmed eyes, paleness around the mouth
The first quiet tired cue is the best moment to start winding down. If you wait for crying, the window has usually already closed.
FREQUENTLY ASKED
What exactly is a wake window?
The stretch of time your baby can stay awake and balanced between two sleeps before tipping into overtiredness. It grows with age, from around an hour for a newborn to several hours for a toddler.
At what age do wake windows start to matter?
In the first weeks babies sleep very irregularly, so wake windows only help as a rough guide. From around 8 to 12 weeks they become more predictable and genuinely useful.
How do I know my baby's wake window is over?
By the early tired cues: a glassy stare, eye rubbing, jerky movements, a first yawn. These show up before the fussing and are more reliable than any number on a chart.
My baby doesn't match the wake windows chart. Is something wrong?
No. The numbers are averages, not requirements. Some babies need shorter windows, some longer, and the same baby can swing from day to day. Your child is the reference point, not the chart.
Do I have to follow wake windows to the minute?
Please don't. Wake windows are a compass for the days when you're unsure, not a schedule you answer to. Your gut feeling stays the most important sensor, and your baby's cues outrank any clock. Darli just gives you a second data point when you want one.
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