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Why do we need sleep?. How much sleep is enough?. What is sleep?. What happens when we don't get enough?. We spend about a third of our lives asleep - it plays a crucial role in our health and wellbeing.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.