Why does the baby often wake up at night? Temperature, clothing, and sleeping bag
Many parents experience periods when their baby wakes often during the night. This can be due to hunger, development, teething, or a need for closeness. But one thing that’s often overlooked is temperature and clothing.
If a baby is too warm or too cold, their sleep may be more restless. This is especially true in summer, when the bedroom temperature can change significantly from evening to night.
Can temperature affect a baby’s sleep?
Yes, temperature can have a major effect on a baby’s sleep. Babies can’t regulate heat in the same way as adults, so they can be more easily affected by too many layers, a sleeping bag that’s too thick, or a warm bedroom.
If a baby often wakes, seems restless, or sweats around the neck, it may be worth checking whether they’re too warm.
Signs that a baby is too warm at night
A baby may be too warm if:
The baby is sweaty around the neck.
The baby has red cheeks.
The baby seems restless and wakes often.
The baby feels very warm on the chest.
The baby kicks or moves around a lot during sleep.
It’s best to feel the baby’s neck or chest. Their hands and feet can feel cool without the baby necessarily being cold.
What if a baby is too cold?
If a baby is too cold, they may also wake more often. Signs can include a cool chest or the baby seeming uncomfortable and having difficulty settling.
On cooler nights, you can choose a long-sleeved bodysuit or a slightly warmer layer under the sleeping bag. The most important thing is to adjust according to the room temperature, not just the season.
What should a baby wear to sleep in summer?
In summer, babies should sleep in lightweight, breathable layers. If the room is warm, a thin bodysuit or short-sleeved bodysuit is often enough under a lightweight sleeping bag.
On warm nights around 25–35°C, avoid thick sleeping bags and multiple layers of clothing. A lightweight summer sleeping bag can be a good alternative to a blanket because it stays around the body without being too heavy.
Can a sleeping bag help a baby sleep more peacefully?
A baby sleeping bag can help some babies sleep more soundly because it provides a consistent, comforting feeling around the body. It also stays in place better than a blanket, which a baby can kick off during the night.
But the sleep sack needs to suit the temperature. If it's too warm, it can cause more restlessness instead of better sleep.
Choose a lightweight sleep sack for warm nights
For summer and warm bedrooms, a lightweight 2-in-1 baby swaddle and sleep sack can be practical. It can give your baby a secure sleep environment without feeling too heavy.
At Lilla Villa, you'll find lightweight 2-in-1 baby swaddles and sleep sacks that are suitable for warm nights around 25–35°C. They are especially relevant if you're looking for a summer solution for your baby, when regular sleep sacks or blankets feel too warm.
What about active babies?
Some babies move around a lot in their sleep. They kick, stretch their arms or try to change position. For active babies, a flexible style that gives them more freedom of movement can be beneficial.
If your baby gets restless from being wrapped too tightly, a sleep sack with freer arms or a 2-in-1 style may be more comfortable.
How to adjust your baby's sleepwear
A simple way to think about it is to start with light layers and adjust based on your baby's temperature.
If your baby is sweaty, remove a layer.
If your baby's chest feels cool, add a light layer.
If the room is warm, choose a lightweight sleep sack.
If your baby moves around a lot, choose a flexible style.
You don't need to dress your baby very warmly just because they are sleeping in a sleep sack. The sleep sack also counts as a layer.
Read also
Want to read more about baby sleep, temperature and sleep sacks? Here are some relevant guides from Lilla Villa:
- Summer sleep sacks for babies: a guide to warm nights and 25–35°C
- What should a baby wear in a sleep sack? A guide to temperature and layers
- Can a baby sleep in a sleep sack?
- Sleep sack vs. blanket for baby - which is best?
- My baby gets their arms out of the sleep sack - is that normal?
Frequently asked questions
Why does my baby often wake up at night?
Babies can wake for many reasons, including hunger, development, teething, the need for closeness or temperature. If your baby is sweating or feels very warm, their clothing and sleep sack may be part of the reason.
How do I know if my baby is too hot?
Feel your baby's neck or chest. If your baby feels warm and sweaty, they may be wearing too many clothes or sleeping in a sleeping bag that's too warm.
Should a baby use a sleeping bag in summer?
A baby can use a sleeping bag in summer if it's lightweight and suitable for warm room temperatures. On very warm nights, fewer layers may be needed.
Is it normal for a baby to sweat in a sleeping bag?
A little warmth can be normal, but if your baby is sweaty around the neck or wakes restlessly, the sleeping bag may be too warm.
What's best for a baby on warm nights?
On warm nights, lightweight layers, breathable materials, and a thin summer sleeping bag are often more comfortable than a thick duvet or winter sleeping bag.
Conclusion
If your baby wakes often during the night, it may be worth looking at the temperature, pajamas, and sleeping bag. A sleeping bag that's too warm or too many layers can lead to restless sleep, especially in summer. For warm nights, a lightweight 2-in-1 baby wrap and sleeping bag can be a practical solution because it provides comfort without feeling too heavy.
Read more about baby sleep
See all our practical guides and our selection of sleeping bags for babies and children.
If your baby wakes up warm or sweaty, you can read how to tell whether the sleeping bag is too warm.
Safety and temperature
When it comes to baby sleep, it's important to consider the baby's actual temperature and the specific sleeping bag's instructions. Feel the baby's chest, back, or neck, and remove a layer if the skin feels warm or damp. Hands and feet can feel cooler without the baby necessarily being cold.
If in doubt about temperature, sleep, or clothing, medical advice should take precedence over general product guides. See, among other resources, Sundhed.dk's advice for newborns.