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Having a tuna sandwich for lunch one day a week – and grilled salmon for dinner one night – could be all you need to sleep better. The journal Sleep Medicine found people who have two servings of oily fish a week sleep deeper and more soundly than those who eat less fish. That’s because the omega‑3 fatty acids help the body produce more sleep-promoting chemicals. That reduces nighttime awakenings and increases vitamin D levels, which help improve sleep, too.

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