By Angelica Videla — Certified Baby and Toddler Sleep Consultant, London | Supporting families across the UK, Europe, US, and Australia
Quick Answer
If your baby resists sleep but still wakes up tired, it's usually a sign of overtiredness or a mismatch in their daily schedule. When the timing isn't quite right, it can make falling asleep harder and sleep less restorative.
Why this is happening
I see this quite a lot with families I work with 🤍
It can feel confusing because your baby clearly needs sleep, but seems to fight it.
Often, this happens when your baby has been awake just a little too long. When that window is missed, the body releases cortisol, which makes it harder to settle even though they're tired.
In some cases, it can also be that sleep pressure isn't quite right during the day, which affects how easily they fall asleep later on.
What's making it worse
- Stretching wake windows “just a bit longer”
- Inconsistent nap timing
- Late bedtimes
- Trying different approaches each day
What actually helps
The focus is on bringing the day back into balance.
That usually means:
- Adjusting wake windows to suit your baby’s age
- Creating more consistency across the day
- Watching patterns over a few days instead of reacting to one moment
When the timing is right, falling asleep becomes much easier.
How this might look in real life
This pattern is very common and usually looks something like this.
- Baby clearly looks exhausted but arches, cries, and resists being settled
- Naps are a battle and baby wakes after only 20–30 minutes looking unrefreshed
- Baby is fussy and irritable throughout the day because sleep keeps being cut short
- Despite being overtired, baby seems wired and unable to relax
- Night sleep starts with a big fight, followed by frequent waking
Why this keeps happening even when you try everything
The most common reason this pattern persists is that overtiredness has become cyclical. Your baby wakes tired, which affects how well they nap, which builds more overtiredness, which makes the next bedtime harder. Parents often try adjusting one thing at a time — bedtime, then naps, then wake windows — but because the whole day is connected, changing one piece in isolation rarely breaks the cycle.
The second reason is that when babies are overtired, their bodies produce cortisol to compensate. This cortisol makes them look wired and alert rather than sleepy, which can lead parents to think the timing is wrong when actually the opposite is true — the window has already passed. Babies who seem to have a “second wind” at bedtime are almost always overtired, not undertired.
The fix is usually a combination of shortening wake windows slightly, protecting the first nap of the day more carefully, and moving bedtime earlier — sometimes by as little as 15 to 20 minutes. These changes compound quickly and most families notice a shift within 3 to 5 days when they are applied consistently.
Frequently Asked Questions
Is it normal for babies to fight sleep even when tired?
Yes — it is one of the most common sleep complaints parents raise. A baby who fights sleep despite obvious tiredness is almost always overtired. The cortisol their body produces to cope with tiredness creates an alert, wired state that makes settling harder.
Will my baby grow out of this on their own?
Sometimes — but only if the underlying schedule issue resolves naturally as the baby develops. If wake windows are too long for your baby's current age, the pattern usually continues until the schedule is adjusted. Waiting it out often prolongs the cycle.
Should I adjust naps or bedtime first?
Start with naps. Bedtime is a consequence of how the day went — if naps are poorly timed or too short, bedtime will always be harder. Getting nap timing right first usually makes bedtime improvements follow naturally.
Can teething cause this pattern?
Teething can temporarily disrupt sleep, but it does not cause persistent bedtime resistance on its own. If the pattern has been going on for more than two weeks, the schedule is almost certainly a bigger factor than teething.
How do I know if my baby is overtired or just not tired enough?
An overtired baby tends to be fussy, difficult to settle, and may have a glazed or manic look. An undertired baby tends to be happy and alert with no sleep cues. If your baby is clearly unhappy at bedtime but fighting sleep, overtiredness is the more likely explanation.
How long does it take to fix once I adjust the schedule?
Most families see improvement within 3 to 5 days of making consistent adjustments. The first night or two may not look different — give it at least a week before concluding the change is not working.