1. The last wake window is off
If bedtime comes too early or too late, sleep pressure may not be right. Look at your baby’s age, naps and evening behaviour.
2. Daytime sleep is unbalanced
Some babies are genuinely overtired. Others have too much daytime sleep or a late nap that pushes bedtime back.
3. Bedtime depends on one specific help
If your baby only falls asleep feeding, rocking or in arms, they may ask for the same support again between cycles.
4. There is a temporary regression or developmental burst
Milestones, teething, illness, travel and routine changes can all disrupt sleep for a while.
Want to know what is disturbing your baby's sleep?
The Petit Nuage sleep quiz looks at age, naps, night waking and settling habits to show you what to focus on first.
Take the 2-minute quiz →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.