What one thing can make our bodies healthier, reduce stress, and provide balance to our lives? Getting enough sleep! When your body is sleep-deprived, it will show negative effects in all other facets of your daily life.
Everyone may agree that your body requires rest, but doing so is easier said than done. Read this article from Becoming Minimalist for more background on the positive effects of rest and steps on how to properly develop the discipline to get more of it: The Lost Practice of Resting One Day Each Week.