Why Your Baby Keeps Waking Up at Night (And It's Not What You Think)

It's 3am. You've fed the baby, checked the diaper, tried the soother. Nothing works. You sit in the dark wondering what you're doing wrong — and the internet isn't helping, because every article gives you a different answer.

Here's the thing most of those articles miss: your baby may not actually have a sleep problem. They may simply have a temperature problem.

"Most babies don't sleep poorly. They're woken up by temperature."

Why Temperature Disrupts Baby Sleep

Babies are born with an underdeveloped thermoregulatory system — meaning their bodies can't efficiently regulate their own temperature the way adults can. Research published in the journal Early Human Development found that a baby's core body temperature drops by about 0.8°C within the first two hours of sleep, then remains low until the early hours of the morning before naturally rising again. Any disruption to that cycle — getting too cold during the drop, or too hot as temperatures rise — can cause a wake-up.

The challenge is that both extremes are dangerous. Being too cold causes babies to cry and rouse, since their bodies burn energy trying to generate warmth. Being too hot is actually riskier — an overheated baby may become lethargic and harder to rouse, which is associated with an increased risk of SIDS. The sweet spot is narrow, and it changes throughout the night.

The Problem with Guessing

Most parents solve this problem by layering — adding or removing blankets based on the season. But here's where it gets tricky: Canadian nights don't cooperate. A room that's perfectly comfortable at bedtime can be significantly cooler by 4am, especially in spring and fall when

heating systems cycle off. And in summer, a room that felt fine at 8pm can be warm and stuffy by midnight.

This constant temperature fluctuation is exactly why so many parents find themselves checking on their baby multiple times a night — not because the baby has a sleep issue, but because the sleep environment keeps changing.

What Actually Works

The key insight is this: rather than trying to match your sleepwear to the temperature, choose a fabric that adapts to temperature on its own. This is the principle behind the Goldie Kids All Season Sleep Sack.

Canadian wool is a naturally thermoregulating fibre. Its unique crimped structure traps warm air when the room is cool, and releases heat and moisture when the room is warm. Unlike synthetic fleece, which simply insulates, wool actively responds to your baby's body temperature — keeping them in that comfortable zone throughout the night without you needing to intervene.

One sleep sack. All seasons. No guessing.

→ Shop the All Season Wool Sleep Sack 

— Goldie Kids

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