Apparently, more than half of the entire world's population is deficient in vitamin D.
This is worrying - particularly when you consider that a lack of vitamin D has been linked to the increasing epidemic of sleep disorders.
This deficiency is perhaps unsurprising when you consider an average day in the lives of many - we live and work indoors, we commute 'indoors' (car, train, bus, etc) and we love to wear sunscreen and sunglasses (and clothes!).
So how can you boost your vitamin D intake?
It's quite simple.
Increase your exposure to the sun and avoid sunscreen whenever possible (but move out of the sun if your skin begins to burn).
I prefer this method to vitamin D supplements since over-supplementation can actually harm sleep - and it's hard to predict just how much of the vitamin your body will absorb in supplement form.
Vitamin D comes with a number of additional benefits. In addition to improving your sleep, it has been found to reduce pain and may even help regulate the immune system and protect against cancer and heart disease.
The best thing about vitamin D?
It's absolutely free and it's absolutely unlimited (except, perhaps, here on the Oregon coast).
Go outside and get some!
Source: The Bulletproof Executive
Last updated: February 28, 2013