Most of us learned that breathing is simple: oxygen goes in, carbon dioxide goes out. But there’s actually a third gas that quietly determines how well you sleep, how calm you feel, and how efficiently your body uses oxygen—nitric oxide.Understanding this three-gas system is especially important right now, because winter creates a perfect storm for poor sleep that doesn’t exist in any other season. While we’re focused on staying warm and cozy, we’re unknowingly sabotaging the very air we breathe all night long. Why Winter Wrecks Your SleepDuring summer, we worry about pollen and wildfire sm...

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