It’s winter, which means hibernating indoors, getting cozy in bed and dark days. Because as the song goes, ‘Baby it’s cold outside,’ so why venture out there?

But unfortunately, there are consequences — especially if you want to get better sleep this winter. And that’s because we get a key nutrient from natural daylight: Vitamin D.

In fact, Dr Otulana, an NHS GP, has said that over a third of Americans don’t get enough Vitamin D, and that’s having huge consequences on sleep. I spoke to him to find out more.

Over 30% of US adults don’t get enough Vitamin D

“From what we understand of national survey data, roughly a third of adults have vitamin D levels that fall below what we would consider optimal,” says Dr Otulana.

Vitamin D is an essential nutrient for our physical and mental health

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