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"For sleep scientists, all of these unpleasant disorders offer tantalizing lines of inquiry. The link between many of them and neurodegenerative disease, or other forms of cognitive impairment, suggests that sleep could be required for cognitive upkeep and function. Their link with heart disease suggests that sleep might serve to relieve vascular stress. The fact that insomnia is associated with depression suggests that sleep might help us deal with emotionally stressful or otherwise disruptive events."

Added in Science