Why does the baby often wake up at night? Temperature, clothing, and sleeping bag

Many parents experience periods when their baby wakes frequently during the night. This may be due to hunger, development, teething, or a need for closeness. But something that is often overlooked is temperature and clothing.

If your baby is too warm or too cold, their sleep may become 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 significant impact on a baby’s sleep. Babies cannot regulate heat in the same way as adults, so they can be more easily affected by too many layers, a sleeping bag that is too thick, or a warm bedroom.

If your baby often wakes, seems restless, or sweats around the neck, it may be worth checking whether they are too warm.

Signs that the baby is too warm at night

The baby may be too warm if:

The baby is sweaty around the neck.
The baby has red cheeks.
The baby seems restless and wakes frequently.
The baby feels very warm on the chest.
The baby kicks or moves a lot in their sleep.

It is best to feel your baby’s neck or chest. Their hands and feet may feel cool without the baby necessarily being cold.

What if the baby is too cold?

If your baby is too cold, they may also wake more often. Signs may include a cool-feeling 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 and not just the season.

What should a baby sleep in during summer?

In summer, your baby should sleep in light, 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, you should avoid thick sleeping bags and multiple layers of clothing. A lightweight summer sleeping bag can be a good alternative to a duvet because it stays around the body without becoming 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 an even, comforting feeling around the body. It also stays in place better than a duvet, which the baby can kick off during the night.

But the sleeping bag must be suitable for the temperature. If it is too warm, it can cause more restlessness instead of better sleep.

Choose a lightweight sleeping bag for warm nights

For summer and warm bedrooms, a lightweight 2-in-1 baby swaddle and sleeping bag can be practical. It can provide your baby with a secure sleep environment without feeling too heavy.

Lilla Villa offers lightweight 2-in-1 baby swaddles and sleeping bags suitable for warm nights around 25–35°C. They are especially relevant if you are looking for a summer solution for your baby, when regular sleeping bags or duvets feel too warm.

What about active babies?

Some babies move a lot in their sleep. They kick, stretch their arms, or try to change position. For active babies, a flexible model that gives them more freedom of movement can be an advantage.

If your baby becomes unsettled from being wrapped too tightly, a sleeping bag with freer arms or a 2-in-1 model may be more comfortable.

How to adjust your baby's nightwear

A simple way to think about it is to start with light layers and adjust them 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 thin sleeping bag.
If your baby moves a lot, choose a flexible model.

There is no need to dress your baby very warmly just because they are sleeping in a sleeping bag. The sleeping bag also counts as a layer.

Read also

Would you like to read more about baby sleep, temperature, and sleeping bags? Here are some relevant guides from Lilla Villa:

• Summer sleeping bag for babies: a guide to warm nights and 25–35°C
• What should a baby wear in a sleeping bag? A guide to temperature and layers
• Can a baby sleep in a sleeping bag?
• Sleeping bag vs. duvet for babies - which is best?
• My baby gets their arms out of the sleeping bag - is that normal?

Frequently asked questions

Why does my baby often wake up at night?

Babies can wake up for many reasons, including hunger, development, teething, the need for closeness, or temperature. If your baby is sweating or feels very warm, clothing and the sleeping bag may be part of the reason.

How do I know if my baby is too warm?

Feel your baby's neck or chest. If your baby is warm and sweaty, they may be wearing too many clothes or sleeping in a sleeping bag that is too warm.

Should a baby use a sleeping bag in summer?

A baby can use a sleeping bag in summer if the model is lightweight and suitable for warm room temperatures. On very warm nights, fewer layers may be necessary.

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 is best for a baby on warm nights?

On warm nights, light 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 frequently at night, it may be worth looking at the temperature, nightwear, and sleeping bag. A sleeping bag that is too warm or too many layers can lead to restless sleep, especially in summer. For warm nights, a light 2-in-1 baby swaddle 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 assess whether the sleeping bag is too warm.

Safety and temperature

When it comes to a baby's sleep, it is important to base your choice on the child'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 may feel cooler without the baby necessarily being cold.

If you are unsure about temperature, sleep, or clothing, advice from healthcare professionals should carry more weight than general product guides. See, among other resources, Sundhed.dk's advice for newborns.