Scenes like this, from Kolkata, are typical across some of India's biggest cities. Dibyangshu Sarkar /AFP/Getty Images hide caption

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A Bad Night's Sleep Might Do More Harm Than You Think

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Researchers say poor sleep quality, too much sleep and too little sleep all play a role in heart health. iStockphoto hide caption

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Good Quality Sleep May Build Healthy Hearts

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Workers try to remove some of the 11 million gallons of oil spilled by the Exxon Valdez off Alaska in 1989. The ship's third mate may have been up for 18 hours before the accident. Rob Stapleton/AP hide caption

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To sleep, perchance to consolidate important connections in far-flung parts of the brain. Alberto Ruggieri/Illustration Works/Getty Images hide caption

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No Rest For Your Sleeping Brain

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Healthful Habits Can Help Induce Sleep Without The Pills

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Katherine Streeter for NPR

Brains Sweep Themselves Clean Of Toxins During Sleep

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