Few things test a new parent like a baby who simply will not sleep at night. The good news: in almost every case there is a reason — and once you know it, there is usually something you can do. Let's walk through the most common answers to "why won't my baby sleep at night?" and the gentle fixes that go with each.
1. Day/night confusion (newborns)
Newborns come into the world with no internal clock, and many have their days and nights flipped — sleeping deeply through the afternoon and wide awake at midnight. This is normal and typically resolves within the first 6–8 weeks. Help it along by making days bright, active and social and nights dark, calm and boring: keep night feeds quiet, dim and free of play.
2. Overtiredness
It sounds backwards, but an overtired baby fights sleep harder, not less. When a baby stays awake too long, stress hormones make settling difficult and wakings more frequent. The fix is often an earlier bedtime and watching wake windows — putting your baby down at the first tired cues rather than waiting for a meltdown.
3. Hunger
In the early months, babies genuinely need to feed overnight — their stomachs are small and empty quickly. Make sure feeds are full during the day, and expect some night feeds for the first several months. During growth spurts, night feeding often temporarily increases.
4. Sleep associations
If your baby only falls asleep while being fed, rocked or held, they may need that same help to get back to sleep every time they surface between sleep cycles — which can mean waking every hour or two. Gradually giving your baby the chance to settle drowsy but awake helps them learn to link cycles on their own.
5. A developmental leap or regression
New skills — rolling, sitting, crawling, and bursts of brain development — often disrupt sleep for a couple of weeks. The well-known 4-month sleep regression is the classic example. These phases are temporary; consistency carries you through them.
6. Discomfort
Gas, teething, a too-warm or too-cold room, reflux or illness can all interrupt sleep. If waking is sudden and out of character, rule out physical discomfort first.
| If the problem is… | Try first |
| Day/night confusion | Bright active days, dark quiet nights |
| Overtiredness | Earlier bedtime, shorter wake windows |
| Sleep associations | Drowsy but awake, consistent routine |
| Discomfort | Check temperature, gas, teething, illness |
The foundation: a consistent routine
Whatever the cause, a calm and predictable bedtime routine is the single most effective tool. The same short sequence every night — feed, bath or wipe-down, dim lights, a song or story — tells your baby's brain that sleep is next. Keep the sleep space dark, quiet and cool, and consider white noise to smooth the transitions between cycles.
Find the pattern behind the wakings
It is almost impossible to spot a sleep pattern from memory at 3 a.m. Trackeron logs every nap, bedtime and night waking with one tap and turns them into clear charts — so you can see whether it is overtiredness, a too-late bedtime, or a passing regression, and act on real information instead of guesswork.
When to talk to your pediatrician
Most night waking is normal. Reach out to your pediatrician if your baby is not gaining weight, seems unwell or in pain, is inconsolable at every sleep, snores heavily or pauses in breathing, or if the sleeplessness is affecting your own wellbeing. Asking for help is always reasonable.
Frequently asked questions
At what age do babies sleep through the night? It varies widely. Many babies manage longer stretches by 6 months, but "through the night" is not a fixed milestone and depends on feeding, temperament and routine.
Should I let my baby cry it out? There are several sleep approaches, from gentle to more structured. Choose what fits your baby and your comfort — there is no single right answer.
The bottom line: when your baby won't sleep at night, start by identifying the likely cause, lean on a steady routine, and give the phase time. Sleep in the first year is a moving target — tracking it makes the pattern, and the path forward, far clearer.