Opinion: "Sleep invisibles" offer a window into your health
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Sleep has long been and – to a great extent – still is the most commonly overlooked necessity of life. Like the air we breathe, the water that sustains us and the food that nourishes us, sleep is critical to our health and well-being. Yet, it is the one commodity that few of us have enough of and, too often, is the first thing sacrificed in our hectic lives.