Why your baby isn't sleeping through the night, and how to really help
If your baby isn't sleeping through the night, there's almost never anything wrong: night waking is part of how sleep develops. The most common causes are hunger, a growth spurt or teething, a room that isn't set up quite right, and separation anxiety. What really helps comes down to three things: a regular daytime rhythm, the same bedtime every evening, and a night-time response that reassures without fully waking them.
It's 3 am, you're standing in the hallway for the third time, and the same thought keeps going round your head: my baby isn't sleeping through the night, and you've run out of things to try. You've read that some babies sleep eight hours straight at two months. Yours doesn't. Before looking for a method, there's one thing to know: in the vast majority of cases, this isn't a problem to solve, it's a stage to get through. This article explains what's really going on at night, then what you can adjust from tonight.
It's normal: night waking is part of development
A baby doesn't sleep like an adult, and it has nothing to do with personality or parenting. Their sleep develops over the first few months, just like their eyesight or their motor skills. Waking up is part of that development.
A baby's sleep cycle is different from ours
Sleep is organised into cycles that follow on from one another. In very young babies, these cycles are shorter than yours and contain a much larger share of light sleep. In practice, your baby surfaces far more often than an adult does.
Each time they surface, one of two things can happen. Either they drift back off on their own and you hear nothing. Or they wake up fully and call for you. Learning to link two cycles without help is exactly what develops, little by little, over the first year.
A baby who wakes at night isn't doing anything wrong – they're just being their age.
At what age do babies sleep through the night, on average?
There's no official age, and that's the most useful answer anyone can give you. Many babies start linking long stretches of sleep between three and six months. Others get there much later, without anything being wrong.
The second point changes everything: "sleeping through the night" doesn't mean "never waking up again". It means your child gets through several cycles without needing you. A baby who grumbles for two minutes then goes back to sleep is sleeping through, even if you hear them.
That's also why a soft evening light earns its place in the nursery very early on. Here, our night lights designed for a baby's room are first and foremost for parents, for all those trips back and forth during the night.
A night light is useful from the very first nights because the parent is the one using it, placed out of reach. It only ends up in your child's hands much later: from 18 months for one-piece soft silicone models, and from 3 years whenever there's a remote control, a button battery or a small part.
Why your baby won't sleep at night: the most common causes
Most night waking comes down to a handful of causes that crop up again and again. Identifying them saves you from changing ten things at once, which never works.
Hunger: the number one culprit in newborns
A tiny tummy empties quickly. In the first few weeks, waking up to feed isn't a problem, it's a need. As long as weight gain is on track and feeds are going well, a night wake-up to feed is simply a night wake-up to feed.
What changes over the months is how much your baby can take in at once. Hunger-related wake-ups then become less frequent on their own, without you having to force anything.
Teething and growth spurts
A tooth coming through is uncomfortable, and that discomfort is felt most at night, when there's nothing to distract them. Growth spurts have a similar effect: appetite suddenly increases and night waking returns for a few days.
What these two causes have in common is that they're temporary. One tough week doesn't undo the habits you've put in place. Stick with your routine and the blip will pass.
Sleep regressions (4 months, 8 months, 18 months)
Your baby was sleeping well, and overnight it all falls apart. These phases often coincide with a developmental leap: learning to roll over, crawl, pull to stand or understand words. Their brain is working so hard that they replay their new skills at night.
These periods usually last a few weeks. The classic mistake is to bring in a new habit in a hurry just to survive, then have to undo it afterwards. Stay the course as much as you can.
The environment: noise, light, temperature
A room that's too warm disrupts sleep more often than one that's a little cool. In the UK, NHS guidance is to keep a baby's room between 16 and 20°C. Also check that nothing is bothering them in the cot and that the room is aired every day.
Light matters just as much. A main light switched on in the middle of the night fully wakes a child who had only half surfaced from their cycle. A night light set to its lowest, with a warm glow, lets you see what you're doing without breaking the night.
Then there's noise. A home is never silent: a door, a creaky floorboard, a car outside. A steady, discreet background sound covers these jolts and stops a single noise from startling your baby at the exact moment they're moving between cycles.
An example Jellyfish Night Light with White Noise 5 white noises and lullabies, food-grade BPA-free silicone, touch-adjustable brightness and a remote control to make changes from across the room. View the night light
Separation and fear of being left alone
At around eight months, your child understands that you still exist when you leave the room. This discovery is good news for their development, and bad news for your nights: being alone in the dark becomes worrying.
It's no longer a physical need but a need for something familiar. A low light left on, a comforter always in the same spot, the same goodnight phrase every time: these three things give a wake-up a familiar setting instead of an empty one.
How to help your baby sleep through the night: practical tips
No method works in one night, so be wary of any that promise to. What works is repetition: the same sequence, at the same times, for several weeks.
Setting up a bedtime routine that works
A routine doesn't need to be long. It needs to be always the same, in the same order, taking the same amount of time. It's that predictability that prepares the body for sleep, not how lovely the moment is.
Dim the lights thirty minutes before
Switch off the main lights in the living area and use only low lamps. The light signal matters as much as the time on the clock.
Always follow the same steps
Bath or wash, pyjamas, last feed, then bedroom. The order matters more than what's in it, so choose a sequence you can keep up even on tired evenings.
Finish in the bedroom, calmly
A story or a song, sitting by the cot, night light on its lowest setting. The last image of the day should be the bedroom, not the living room.
Leave with the same phrase
A short phrase, the same every evening, said in the same tone. It marks the end of the routine and avoids the back-and-forth that drags bedtime out.
Teaching your baby to fall asleep on their own, without dependence
If your child always falls asleep in your arms, they'll naturally look for your arms in the middle of the night, because that's the setting they fell asleep in. The bedtime setting becomes the wake-up setting.
The adjustment is to put them down still awake but already drowsy. It doesn't happen in one evening, and it doesn't mean leaving them to get on with it. You stay by the cot, say little, and gradually move further away over the weeks.
For older children, the same principle works with a light they see as their own. That's often what parents come looking for in our range of children's night lights, once the baby stage is over.
Adjusting daytime schedules and naps
A difficult night often starts in the afternoon. A child who has slept too late in the day doesn't have enough sleep pressure in the evening. On the other hand, an overtired child struggles to fall asleep and wakes more often.
A regular wake-up time
Wake them at roughly the same time every morning. The wake-up time sets the rhythm for the rest of the day.
Naps at set times
Naps that always fall at the same times are better than a perfect total number of hours spread all over the place.
No naps too late in the day
A nap that runs into the late afternoon pushes bedtime back and breaks up the night that follows.
Morning light
Open the curtains early and go outside if you can. The contrast between day and night helps the body clock settle.
When to step in at night, and when to wait
Not every sound is a call for you. A baby who whimpers between two cycles is often in the middle of going back to sleep. Rushing in at the first sound can wake them up for good.
Give yourself a few moments to listen before going in. If the crying builds, if the rhythm changes, if the sound becomes constant, then go in. Once you're there, keep it night-time: little light, few words, few movements. A lamp you switch on with a single tap, without hunting for a switch or turning on the main light, makes a real difference at that hour.
The model featured Portable Touch Night Light Touch sensor to set the brightness with one gesture, warm white or cool white, cordless with 22.5 h of battery life and USB charging. View the night light
Baby waking up crying at night: how to respond
Not all night-time crying is the same. Learning to tell the difference saves you from feeding a baby who isn't hungry, or rocking a baby who is simply thirsty.
Telling a hungry cry from a comfort cry
No table replaces your own observation, and you know your child better than anyone. These pointers are only there to put words to what you already sense.
| What you notice | More likely a hungry cry | More likely a comfort cry |
|---|---|---|
| How it starts | Builds gradually, then settles into a pattern | Starts loud, dies down quickly if nothing happens |
| The rhythm | Regular, insistent, with short pauses | Irregular, broken up by long silences |
| Movements | Rooting with the mouth, hands to the face | Turns over, looks for a position, bangs the mattress |
| The effect of your presence | Not enough to calm them for long | A hand on them and a low voice are often enough |
Reassuring without creating new habits
The rule is easy to say and hard to stick to: respond to the need, not to the waking. A hungry baby is fed. A frightened baby is reassured on the spot, in their cot, without moving rooms.
What creates dependence isn't going in – it's adding a new ingredient every night: a brighter light, a walk down the hallway, a trip into your bed. Keep the night boring, on purpose.
- You can see without switching on the main light
- Waking happens in a familiar setting
- Night-time nappy changes and feeds are quicker
- It gives the bedtime routine a fixed point of reference
- It won't make a hungry baby sleep
- It doesn't shorten sleep cycles
- It doesn't replace a regular daytime rhythm
- If it's too bright, it can get in the way instead of helping
This article gives general guidance and doesn't replace medical advice. If night waking comes with signs that worry you, or if exhaustion at home is becoming too much, talk to a health professional who knows your child.
Frequently asked questions about baby sleep
At what age do babies sleep through the night?
There's no single age. Many babies sleep for long stretches between 3 and 6 months, others much later, and both are perfectly ordinary. What matters more than age is a regular daytime rhythm and a bedtime that happens the same way every evening.
My 3-month-old isn't sleeping through the night – is that a problem?
No. At 3 months, waking at night is still the rule rather than the exception, often to feed. Their tummy is small and their sleep cycles are short. Look at the bigger picture instead: a baby who feeds well, gains weight and catches up on sleep during the day is doing fine, even if they still wake you.
Should you let your baby cry at night?
There's no single answer, and no method suits every family. Waiting a few moments before stepping in sometimes lets your child go back to sleep on their own. Crying that builds, goes on or changes in nature needs a response. If in doubt, talk to a health professional.
Does a night light help babies sleep better?
A night light doesn't make a child sleep; it makes wake-ups easier to get through. A low, warm light lets you feed, change or comfort your baby without switching on the main light, so without waking them fully. Set to its lowest and placed out of reach, it becomes a bedtime landmark.
When should you see a doctor about your baby's sleep?
Talk to a health professional if night waking comes with unusual crying, a temperature, snoring, pauses in breathing, loss of appetite or a drop-off in their weight curve. It's also the right thing to do if exhaustion is becoming too much to cope with at home.
Patience and consistency: the two keys
If you remember only one thing: sleep isn't trained, it's built. Your job isn't to force a full night, but to make the conditions as stable as possible, evening after evening, until your child gets there by themselves.
Choose just two or three changes, the ones that feel manageable, and keep them up for at least two weeks before judging. Switching methods every three days is the surest way to make none of them work. And nights that slip back after progress aren't a return to square one – they're part of the journey.
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