STORY AT-A-GLANCE Getting eight hours of high-quality sleep per night is one of the cornerstones of health Sleep deprivation is extremely common and can weaken your immune system, accelerate tumor growth, accelerate diabetes and impair all aspects of your cognition; lack of sleep can increase your risk of dying from all causes Optimizing your sleep sanctuary is part of exercising good sleep hygiene; several ways of doing this are discussed What you do in preparation for bed is also very important, and numerous suggestions are discussed To improve your sleep, you may need to modify some of your lifestyle choices, including diet and exercise
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