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Parents in the UK might find it bizarre that in Nordic countries, such as Norway and Denmark, it's normal to see babies napping outside cafés seemingly unaccompanied - but it turns out it's not a new idea
The technique is making waves through TikTok and Instagram as people from Britain and America embrace the idea of getting a better sleep by benefitting from the cold.
Annie Samples, 36, from Texas, has more than 200,000 followers on TikTok, where she documents what it's like to raise a family in one of the happiest and safest countries in the world.