You know your baby is tired. They were yawning ten minutes ago, rubbing their eyes and starting to become a little less cheerful about life. You begin settling them, expecting sleep to follow.
Instead, they suddenly seem to have discovered a second career.
They wriggle, arch, turn away, want to feed and then do not want to feed, complain when you hold them and complain when you put them down. A toddler may become urgently interested in drinking water, finding a particular toy or discussing something that happened three days ago.
It is very easy to interpret all of this as fighting sleep. But babies are not actually fighting a biological need to sleep. Usually, their behaviour is telling us that sleep is not coming easily at that particular moment. The useful question is why.
Is my baby overtired?
Possibly. But not every difficult bedtime is overtiredness. Overtiredness has become an almost automatic explanation for baby sleep problems. If a baby takes a long time to fall asleep, they are overtired. If they wake frequently, they are overtired. If they take a short nap, they are overtired. Eventually the diagnosis becomes difficult to disprove.
Babies certainly can become tired, distressed and harder to settle after being awake for longer than they can comfortably manage. A very tired baby may cry, become agitated or struggle to settle despite clearly needing sleep.
But there is another possibility that is discussed much less often: Your baby may simply not be sleepy enough yet.
Sometimes bedtime is too early
Sleep pressure builds while we are awake. If your baby has not been awake long enough for sufficient sleep pressure to accumulate, trying to make sleep happen can become a surprisingly lengthy project.
This is particularly common as babies get older and their sleep patterns change. A nap that used to work perfectly may gradually move later. The final nap may start interfering with bedtime. A toddler who once fell asleep easily at seven may now lie awake for an hour because their daytime nap has changed.
The bedtime routine has not suddenly stopped working. Your child may simply need a little more wakefulness before they are ready to sleep. If settling routinely takes forty-five minutes or an hour while your baby is relatively cheerful and alert, I would look at timing before assuming there is a settling problem.
But sometimes they really are very tired
The opposite can happen too. Perhaps naps were unusually short. Your baby has been at nursery all day. You travelled, had visitors or simply had one of those days when sleep happened wherever it could.
By evening, your baby may be exhausted and less able to manage the transition into sleep calmly.
In that situation, keeping them awake longer because a wake-window chart says bedtime should be at 7:30 is unlikely to help. This is why I prefer looking at the baby and the whole day rather than deciding that every bedtime problem has the same cause.
Watch what happens when you try
One of the most useful pieces of information is simply what your baby does when you offer sleep. If they settle reasonably quickly, the timing was probably workable. If they are wide awake, playing, chatting or repeatedly trying to escape from the process, they may not be ready yet.
If they are clearly exhausted and distressed, the problem may be different. They may need more help settling, an earlier opportunity to sleep, or simply more support after a difficult day. You do not need to identify the exact minute at which your baby becomes “ready for sleep”. Look for patterns over several days rather than treating one difficult bedtime as evidence that the entire schedule is wrong.
Wake windows can help, but they cannot tell you when your baby must sleep
Wake windows can be useful as a rough way of noticing how long your baby tends to stay comfortably awake. The problem begins when an average becomes a prescription.
Two babies of the same age do not necessarily need exactly the same amount of sleep, and the same baby will not necessarily stay awake for exactly the same length of time every day. Nap length, morning wake time, activity, illness, development and the previous night’s sleep can all change the shape of the day.
If the chart says your baby should sleep after two hours but they consistently fall asleep happily after two and a half, the baby is giving you more useful information than the chart.
What about sleepy cues?
Yawning, rubbing the eyes, becoming quieter, seeking contact or losing interest in play can all be useful signs that sleep may be approaching. But sleepy cues are not a perfect diagnostic system either.
A baby may yawn without being ready to sleep. Older babies and toddlers can become harder to read, and the obvious newborn signs may become less reliable. Sometimes what looks like tiredness is boredom, hunger, frustration or simply a request for a change of activity.
Rather than responding to the first yawn as an emergency, combine what you see with what you already know about your baby’s day. If they have been awake for a while, are becoming quieter and then settle easily, lovely. If they yawn after being awake for forty minutes and then spend half an hour vigorously objecting to a nap, perhaps the yawn was not an instruction.
Why does my baby suddenly fight naps they used to take?
This is often one of the first signs that a sleep pattern is changing. During a nap transition, the old arrangement gradually stops fitting. Your baby may refuse the final nap on some days but still desperately need it on others. Two naps may suddenly make bedtime very late, while one nap is not yet quite enough. This can look wonderfully inconsistent because it is inconsistent.
Nap transitions are usually periods of adjustment rather than clean switches from one schedule to another.
You may need two naps one day and one the next. A tiny bridge nap may rescue the evening occasionally. Bedtime may move depending on what happened during the day. Trying harder to make the disappearing nap happen is not always the answer.
Why does my baby fight sleep with me but not somebody else?
Because you are not interchangeable. Your baby has different expectations with different people. They may breastfeed to sleep with you but happily accept rocking from somebody else. They may protest when you try a new settling method because they know exactly what normally happens with you.
That does not mean they are manipulating you. Nor does it mean the other caregiver has discovered the secret technique you somehow missed. Relationships create context. Babies can learn more than one route into sleep, and the way they settle with one person does not have to be identical to the way they settle with another.
What about separation anxiety?
As babies become increasingly aware that you can move away from them, separation can become much more relevant around sleep. Sleep involves a kind of separation. The room becomes quieter, interaction reduces and you may be trying to put your baby down or leave.
A baby who was previously happy to be placed in their cot may suddenly protest. An older baby may repeatedly stand up as soon as you lower them. A toddler may desperately need one more cuddle precisely when you thought bedtime was finished.
I would not automatically interpret this as a sleep habit that needs correcting. Sometimes your baby is objecting to separation rather than sleep itself. Offering more reassurance during these phases does not prevent independence. Development keeps moving even when you respond.
New skills can make sleep temporarily more interesting
Rolling, crawling, standing, walking and language development can all coincide with changes in sleep behaviour. A baby who has just discovered standing may practise it in the cot because standing is currently the most exciting thing they know how to do. Unfortunately, they may not yet be equally skilled at getting back down.
A toddler whose language is exploding may suddenly have a great deal to tell you at bedtime. I would be cautious about attributing every difficult week to a “developmental leap”, because that term is often used much more precisely than the evidence allows. But development absolutely changes behaviour, and sleep happens inside development rather than separately from it. Sometimes the best response is simply to give a new phase some time.
Could the way I settle my baby be the problem?
Sometimes a settling method stops working as well as it once did. Perhaps your baby used to fall asleep while being rocked but now twists around trying to look at everything. Perhaps feeding to sleep still works at night but no longer works for one daytime nap. Perhaps your toddler used to enjoy lying beside you but now spends forty minutes climbing over you.
You do not have to abandon a method simply because it failed twice. But if you are repeatedly working very hard to make something happen and your child is repeatedly resisting it, you are allowed to experiment.
Try a different position. Let another caregiver settle them. Feed first and then cuddle. Go outside with the pram. Stop for twenty minutes and try again. Responsive sleep support is not about finding one perfect technique and using it forever. Your baby changes, so the support that works may change too.
When should I think beyond normal sleep behaviour?
If the change is sudden or your baby seems uncomfortable rather than simply reluctant to sleep, look beyond timing and settling. Illness, pain, reflux symptoms, breathing difficulties, eczema, teething discomfort, hunger or other physical problems can all make sleep more difficult. Persistent snoring, pauses in breathing or obvious difficulty breathing during sleep deserve medical attention.
You know what your baby’s ordinary behaviour looks like. If something feels distinctly different, particularly alongside other symptoms, do not assume everything is a sleep problem.
You do not have to win bedtime
When sleep becomes difficult, it is very easy for settling to turn into a battle. You have been trying for forty minutes, so stopping now feels as though those forty minutes were wasted. They were not. Sometimes the most useful thing you can do is stop trying for a little while. Turn the light back on. Have a cuddle. Walk into another room. Let your toddler look at a book. Give everybody ten or twenty minutes to reset and then try again.
If your baby is genuinely ready for sleep, you may find that the second attempt is much easier. If they are not, you have saved yourself another forty minutes of trying to persuade an awake human being to become unconscious. Sleep is a biological process. We can create conditions that make it easier, but we cannot force it. So when your baby seems to be fighting sleep, do not begin by asking how to make them surrender.
Look at the day. Look at their naps. Look at how long they have been awake, whether their sleep pattern may be changing, whether they need more closeness or whether something seems uncomfortable. And sometimes, look at the clock and try again later.
Research
Galland BC, Taylor BJ, Elder DE, Herbison P. (2012). Normal sleep patterns in infants and children: a systematic review of observational studies. Sleep Medicine Reviews, 16(3), 213–222.
Paavonen EJ, Saarenpää-Heikkilä O, Pölkki P, Kylliäinen A, Porkka-Heiskanen T, Paunio T. (2020). Normal sleep development in infants: findings from two large birth cohorts. Sleep Medicine, 69, 145–154.
Staton S, Rankin PS, Harding M, et al. (2020). Many naps, one nap, none: a systematic review and meta-analysis of napping patterns in children 0–12 years. Sleep Medicine Reviews, 50, 101247.
LeBourgeois MK, Carskadon MA, Akacem LD, et al. (2013). Circadian phase and its relationship to nighttime sleep in toddlers. Journal of Biological Rhythms, 28(5), 322–331.