From the 2017 issue of Weill Cornell Medical College Improving Sleep

1. What is Sleep, and Why Do We Need It?

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By UHN • November 29, 2016

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When we’re asleep, our conscious mind is closed to the outside world. Sounds, smells, and physical sensations have limited access to our central nervous system. In the lightest stages of sleep, those aspects of the real world can intrude and awaken us briefly, but in deep sleep we’re not easily roused. During sleep, our heart […]

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