Why Do Babies Fight Sleep?

When I first wrote this post, my youngest was ten months old and asleep in her cot beside me. She slept beautifully at night but daytime naps were much more unpredictable. Some days she would settle without any trouble. On others, she seemed determined to stay awake despite being obviously exhausted. Now, as a mum of two, I know how frustrating this can be. Oh, why do babies fight sleep? You can feed your baby, change them, cuddle them and create what feels like the perfect sleeping environment, only for them to cry, wriggle or suddenly behave as if sleep is the last thing on their mind.

So why do babies fight sleep, especially when they are clearly tired?

Usually, it is because something is making it difficult for them to settle. They may be overtired, not tired enough, hungry, uncomfortable or simply too interested in what is happening around them. Young babies can also need plenty of reassurance and closeness before they feel ready to sleep.

It doesn’t mean you have done anything wrong, and your baby isn’t deliberately trying to stay awake. They are communicating that they need something, even if working out what that is takes a little trial and error.

Why Your Baby May Be Fighting Sleep

There isn’t one single reason babies resist naps or bedtime. Sometimes the cause is obvious. At other times, you work through every possibility and still don’t find a clear answer.

These are some of the most common reasons that might help with the question, why do babies fight sleep?

Your Baby Is Overtired – Why Do Babies Fight Sleep?

Overtiredness is one of the biggest reasons babies fight sleep.

It sounds completely backwards. Surely an exhausted baby should fall asleep more easily? Unfortunately, it doesn’t always work that way.

If a baby stays awake for longer than they can comfortably manage, they may become increasingly unsettled. Instead of drifting off, they cry, arch their back, wriggle or appear to get a sudden burst of energy.

Common signs of tiredness include:

Yawning
Rubbing their eyes
Looking away or losing interest
Becoming quieter
Staring into the distance
Wanting to suck or feed
Becoming increasingly fussy
Crying when you try to put them down

Crying is often a later tired sign. If possible, begin winding things down when you notice the earlier signs rather than waiting until your baby is extremely upset.

Try not to become too fixated on exact wake windows from an app or chart. They can offer a rough guide, but babies don’t all require sleep at precisely the same time. Your own baby’s behaviour is usually more useful than the clock.

They Aren’t Tired Enough Yet – Why Do Babies Fight Sleep?

The opposite can also be true.

If your baby has recently had a long nap or has not been awake for very long, they might simply not be ready for another sleep. This can look like sleep fighting, but your baby may actually be telling you that they need a little more awake time.

A baby who is not tired enough may:

Lie happily in their cot
Babble or play
Kick their legs
Look around the room
Become annoyed when you repeatedly try to settle them
Fall asleep eventually but wake after a very short nap

If they are calm and alert, take a short break. Have a quiet cuddle, read a book or move into another room for ten minutes before trying again.

This is often more effective than spending a long time trying to persuade a wide-awake baby to sleep.

They Are Hungry – Why Do Babies Fight Sleep?

Hunger is an especially common reason for younger babies to struggle with sleep.

Babies have small stomachs and need to feed regularly. During growth spurts, they may want milk more frequently than usual. Even if a feed isn’t normally due, it is worth considering whether hunger could be preventing them from settling.

Look for feeding cues such as:

Turning their head and opening their mouth
Putting their hands in their mouth
Becoming restless
Making sucking movements
Rooting against your chest
Crying

Young babies should be fed responsively rather than expected to wait for a rigid schedule.

If you are currently combining breast and bottle feeding, my guide to the best bottles for breastfed babies may also be helpful.

They Are Overstimulated -Why Do Babies Fight Sleep?

Babies take in an enormous amount from their surroundings. Bright lights, television, noisy toys, visitors and energetic play can all make it difficult for them to switch off.

Sometimes a baby will look as though they have suddenly stopped being tired. In reality, they may have become overstimulated and need help calming down.

Before a nap or bedtime, try:

Dimming the lights
Turning off the television
Putting noisy toys away
Moving into a quieter room
Speaking softly
Holding or gently rocking your baby
Following the same short settling routine

You don’t need to make the entire house silent. Normal household noise during the day is fine for many babies. The aim is to reduce excitement, rather than create perfect silence.

The NHS recommends making daytime and night-time feel different. During the day, open the curtains and continue with ordinary activities. At night, keep the lights low, speak quietly and avoid playing with your baby. You can read the full NHS baby sleep guidance here. NHS

They Want Comfort or Closeness – Why Do Babies Fight Sleep?

Some babies find it difficult to settle unless they are being held, fed or rocked. This is particularly common during the newborn months.

Your baby has spent nine months feeling warm, contained and close to you. Wanting that closeness after birth is completely normal. Responding to them with cuddles and reassurance is not spoiling them.

You may find that your baby falls asleep in your arms but wakes as soon as you place them down. If this is happening regularly, you may also find my post on helping a newborn sleep without being held useful.

Try placing them down slowly, keeping one hand gently on their chest for a moment and giving them time to settle. If it doesn’t work every time, that doesn’t mean you have failed. Sleep develops gradually.

Separation Anxiety May Be Making Bedtime Harder

As babies become more aware of the people around them, they may become upset when a parent leaves the room.

Separation anxiety commonly begins during the second half of a baby’s first year, although every child is different. It can suddenly turn a previously straightforward bedtime into a much longer process.

During the day, simple games such as peek-a-boo can help your baby begin to understand that people still exist when they disappear from view. I have written more about this in When Do Babies Play Peek-a-Boo?.

At bedtime, offer calm reassurance. You might sit beside the cot, use your voice to comfort your baby or return briefly if they become upset.

There is no need to disappear without saying goodnight in the hope that they won’t notice. A predictable goodbye can feel much more reassuring.

Their Nappy Is Wet or Dirty – Why Do Babies Fight Sleep?

This is a simple one, but it is easily missed when you are tired and have already changed your baby shortly before bed.

Some babies aren’t bothered by a wet nappy. Others won’t settle until they feel completely dry. A dirty nappy should always be changed promptly to keep your baby comfortable and protect their skin.

If your baby has been fed and still won’t settle, a quick nappy check is worthwhile.

They Are Too Hot or Too Cold -Why Do Babies Fight Sleep?

Temperature can make it much harder for babies to sleep comfortably.

The Lullaby Trust recommends a room temperature of 16°C to 20°C. Check your baby’s chest or the back of their neck rather than their hands and feet, which can naturally feel cooler.

If their skin feels hot or sweaty, remove a layer. If you are unsure what they should wear, check the tog guidance supplied with their sleeping bag and follow current safer-sleep advice.

Teething or Illness Is Making Them Uncomfortable

Teething can leave babies with sore gums, increased dribbling and a strong urge to chew. This discomfort may make settling more difficult.

However, symptoms such as a high temperature, diarrhoea or your baby appearing generally unwell should not automatically be blamed on teething.

Other possible causes of discomfort include:

A cough or cold
Reflux
Wind
Constipation
An ear infection
A skin irritation
Being too hot or cold

If your baby’s cry sounds different, they cannot be comforted or they are not feeding normally, seek medical advice. The NHS recommends contacting your GP or NHS 111 if your baby appears unwell, including if they have a high temperature or are not interested in feeding. NHS

They Are Learning Something New – Why Do Babies Fight Sleep?

Babies’ brains and bodies develop remarkably quickly. Rolling, crawling, standing, babbling and becoming more aware of their surroundings can all temporarily affect sleep.

You may put your baby into their cot only to find them practising their newest skill rather than sleeping.

If they are safe and content, give them a little time. If they become upset, help them settle and try again.

Parents often refer to these unsettled periods as “sleep regressions”. You may hear about a four-month, eight-month or eighteen-month regression, but babies do not follow an exact calendar. A disrupted week doesn’t always mean your baby has reached a named sleep stage.

Growth, illness, teething, changing nap needs and new skills can all affect sleep at different times.

Their Routine Has Changed

Holidays, nursery, moving house, returning to work and the clocks changing can all interfere with a familiar sleep pattern.

Even an exciting day out or a late nap in the car can alter bedtime.

Try to keep the familiar parts of your routine in place, even when the timings have changed. The same sleeping bag, book, song or goodnight phrase can provide a reassuring signal.

If the seasonal clock change is approaching, see my guide to adjusting babies to daylight saving time.

How to Help a Baby Who Is Fighting Sleep

When your baby refuses to sleep, it is tempting to keep adding new things: another song, another toy, another trip downstairs and another attempt at rocking.

Sometimes, all that extra activity makes settling even harder.

Start with the basics:

Check whether your baby is hungry.
Check their nappy.
Make sure they are comfortably dressed.
Look for signs of illness or pain.
Reduce light and noise.
Offer closeness and reassurance.
Give them time to calm down.

If your baby becomes increasingly distressed, pause. Pick them up, comfort them and reset the situation before trying again.

A difficult nap doesn’t need to turn into a battle that lasts the entire afternoon.

Create a Short Bedtime Routine

A bedtime routine doesn’t need to be complicated or Instagram-perfect. It just needs to be familiar.

Ours might not look exactly like yours, and that is fine. The most useful routine is one you can repeat on ordinary evenings when everyone is tired.

You could include:

A bath or quick wash
A clean nappy
Pyjamas and a sleeping bag
A milk feed
A short story
A cuddle or lullaby
Lights down
Bed

For daytime naps, use a shorter version. Close the curtains, change the nappy, put on the sleeping bag and use the same phrase or song each time.

Over time, these little cues can help your baby recognise what is coming next.

Should You Keep Trying When a Baby Refuses to Nap?

Not indefinitely.

If you have been trying for a while and your baby is becoming more awake or upset, stop and have a break. Move into another room, let them look at a book or have a quiet cuddle.

Try again after ten or fifteen minutes if they still seem tired.

Occasionally a nap simply doesn’t happen. On those days, you may need to bring the next nap or bedtime forward slightly. One missed nap will not undo every good sleep habit you have established.

What If Your Baby Suddenly Starts Fighting Sleep?

A sudden change is often a clue that something else has changed too.

Consider whether:

They are developing a new skill
They are unwell
They are teething
Their existing nap schedule no longer suits them
They have started nursery
They recently moved into a different room
The clocks have changed
They are going through a period of increased hunger
Their final nap is now too late or too long

You may not need to change everything. Give it a few days, observe when the difficulty happens and adjust one thing at a time.

A simple note on your phone showing naps, feeds and unsettled periods can make patterns much easier to spot.

Safe Sleep Still Matters

However your baby falls asleep, continue following current safer-sleep guidance.

Place your baby on their back in their own clear, flat and firm sleep space. Keep the cot free from pillows, cot bumpers, toys, nests, positioners and loose or bulky bedding.

For at least the first six months, your baby should sleep in the same room as you during the day and at night.

You can read the full recommendations on the Lullaby Trust safer sleep website.

If you are considering moving your baby, my guide explains when babies can sleep in their own room.

When to Speak to Your Health Visitor or GP

Sleep resistance on its own is usually a normal part of babyhood. However, speak to your health visitor or GP if:

Your baby appears to be in pain
They are feeding much less than usual
They have fewer wet nappies
They are vomiting repeatedly
Their cry sounds unusual
They are difficult to wake
You are concerned about their breathing
They have a temperature and seem unwell
You are struggling to cope with their sleep or crying

Trust your instincts. You know what is normal for your baby.

If constant crying is leaving you overwhelmed, place your baby safely in their cot and step into another room for a few minutes to calm yourself. Never shake a baby. Ask someone you trust to take over if possible, or contact your health visitor, GP or NHS 111 for support.

Frequently Asked Questions

Why Does My Baby Fight Sleep Even When They Are Tired?

An overtired baby may find it harder to relax and settle. Hunger, discomfort, overstimulation and wanting closeness can also make a tired baby resist sleep.

Start calming things down when you notice their earlier tired signs rather than waiting until they are extremely upset.

Why Is My Baby Arching Their Back and Crying at Bedtime?

Babies may arch their backs when they are overtired, overstimulated, uncomfortable or frustrated. It can also happen with wind or reflux.

If it happens frequently, appears painful, affects feeding or is accompanied by other symptoms, speak to your health visitor or GP.

Why Does My Baby Fight Naps but Sleep Well at Night?

Daytime sleep can be more difficult because the house is brighter, noisier and more interesting. Your baby may also be going down for a nap before they are tired enough or after they have become overtired.

A short, consistent nap routine and watching your baby’s tired signs may help.

Do Babies Fight Sleep During a Sleep Regression?

They can, but not every unsettled period is a sleep regression. New skills, illness, teething, separation anxiety and changing sleep needs can all affect naps and bedtime.

Rather than concentrating on a particular regression date, look at what has recently changed for your baby.

Should I Let My Baby Cry When They Fight Sleep?

There are different approaches to settling babies, and families make different choices. You do not have to leave your baby to cry if it does not feel right for you.

Young babies rely on adults for comfort and regulation. You can respond, cuddle them and help them settle while gradually developing a routine that works for your family.

How Long Does the Sleep-Fighting Phase Last?

It depends on the cause. A missed nap may be a one-off, while disruption caused by illness, teething or a developmental change may last longer.

If it continues, keep a short sleep diary and speak to your health visitor. They can help you consider your baby’s age, feeds, health and overall sleep pattern.