What is the frozen hot water bottle hack for helping children sleep in a heatwave?
Fill a hot water bottle only partway with water — never full, because water expands when frozen and a full bottle can burst — then freeze it without its furry cover. At bedtime, place the frozen bottle in your child's bed so they can lean it against their chest or back. It acts as a cold pack that stays cool throughout the night, making it one of the most popular and practical sleep hacks for children during a heatwave.
Bill Clapson and Emily Clapson discuss this method in the first episode of The Toddle About Show's new format, recorded in early July 2026 — by which point they had already lived through four heatwaves. The Clapsons describe sleep disruption as the single biggest challenge of hot weather with children: their daughters Florence and Aurora, aged eight and six, were struggling to settle, with bedtimes stretching as late as half past seven or eight o'clock. The frozen bottle is presented not as a fringe idea but as a currently circulating, widely shared tip — the kind of thing spreading through parent WhatsApp groups and late-night Google searches. You can hear the full conversation on Listenly.
How to do it — step by step
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1Remove the cover Take the hot water bottle out of its furry or fabric sleeve before freezing. The cover insulates and slows down the cold transfer — removing it gives better results.
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2Fill it only partway Add water to roughly half or two-thirds capacity. Water expands as it freezes, so a full bottle risks splitting or deforming.
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3Freeze it Pop the uncovered, partially filled bottle in the freezer and leave it until it is solid.
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4Place it in the bed at night At bedtime, put the frozen bottle in your child's bed. Let them rest it against their chest or back — it stays cold long enough to help them sleep through the warmest hours of the night.
"Put something cold on your wrists because the blood vessels are much closer to the skin and then you're almost cooling yourself on the inside."
— Bill Clapson, The Toddle About ShowThe frozen bottle tip sits alongside other body-cooling principles that Clapson mentions in the same episode — like pressing something cold against pulse points such as the wrists, where blood vessels sit close to the surface and can cool the blood flowing inward. The underlying logic is the same: target the right spot, and you cool the whole body more efficiently than simply making the room feel cooler.
See also
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