Because I have absolutely no trouble falling asleep, I didn’t realise for years that my 3am wakeups actually constituted a form of insomnia (sleep maintenance insomnia, to be precise). Both have stuck, but what about my now months-long habit of taking a daily vitamin D supplement daily? Amy Glover / HuffPost UK Vitamin DAdvertisementWait, does vitamin D help with sleep? It’s even been linked to obstructive sleep apnoea (OSA), though that’s a bit of a “chicken and egg” scenario – maybe OSA causes vitamin D deficiency, a 2024 paper said, or maybe the lack of vitamin D raises OSA risk. AdvertisementEither way, a 2022 review and meta-analysis of studies found that vitamin D supplementation seemed to be linked to better sleep quality.

Source: Huffington Post January 23, 2026 11:14 UTC