What, according to the article, is important for good quality sleep? 1. Absence of health problems. 2. A five-⁠day working week. 3. Five to seven hours of nighttime sleep. 4. Higher productivity at work.

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What, according to the article, is important for good quality sleep? 1.  Absence of health problems. 2.  A five-⁠day working week. 3.  Five to seven hours of nighttime sleep. 4.  Higher productivity at work.

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