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Night sleep guide · United Kingdom

Baby won't sleep at night: 7 causes to check first

When a baby will not sleep at night, parents often feel they have tried everything. There are several common factors worth looking at first.

Key takeawayA practical checklist to help you identify what may be keeping your baby awake at night.
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1. The final wake window may not suit your baby

If bedtime is too early or too late, your baby may struggle to settle. Look at your baby’s age, naps and evening behaviour.

2. Daytime sleep may need adjusting

Some babies are genuinely overtired. Others have too much daytime sleep or a late nap that pushes bedtime back.

3. Your baby may rely on a particular way of settling

If your baby usually falls asleep while feeding, being rocked or being held, they may ask for the same support again between cycles.

4. Developmental changes may be disrupting sleep

Milestones, teething, illness, travel and routine changes can all disrupt sleep for a while.

5. Your baby may be hungry or need reassurance

Especially in the early months, waking for a feed or comfort is completely normal. Follow your baby’s needs and speak to your health visitor if you have questions about feeding.

6. Your baby may be uncomfortable or unwell

Temperature, teething or illness can make sleep harder. If your baby seems unwell or has symptoms that concern you, seek medical advice before changing their sleep routine.

7. Your baby may need a calmer bedtime routine

A simple, predictable wind-down can make the change from playtime to bedtime feel easier. Try keeping the lights low and following the same gentle steps each evening.

Important: every baby's sleep is different. Avoid one-size-fits-all promises, and always put feeding, growth and safer sleep first.
Safer sleep reminder. For babies, use a firm, flat sleep surface and follow the latest safer sleep advice from the NHS and The Lullaby Trust.

What's affecting your baby's sleep?

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Frequently asked questions

Why is my baby suddenly fighting sleep at night?

A change in age, naps, bedtime timing or development can shift sleep very quickly.

Should I let my baby cry?

No. You can make changes gradually and still respond to your baby.

How long should I test one change?

Give it several days when possible so you can see a pattern rather than one random night.

Reference sources: NHS baby sleep guidance · The Lullaby Trust safer sleep information. Last updated: 28 October 2026.