http://healthysleep.med.harvard.edu/healthy/matters/benefits-of-sleep/why-do-we-sleep, "Everyone feels better after a good night’s rest. But now, thanks to a report from the National Sleep Foundation, you can aim for a targeted sleep number tailored to your age.The foundation based its report on two years of research. Published in a recent issue of the foundation’s journal Sleep Health, the report updates previous sleep recommendations. It breaks them into nine age-specific categories with a range for each, which allows for individual differences: our bodies regulate sleep in much the same way that they regulate eating, drinking, and breathing. This suggests that sleep serves a similar critical role in our health and well being. Although it is difficult to answer the question, "why do we sleep" scientists have developed several theories that together may help explain why we spend a third of our lives …show more content…
http://www.webmd.com/sleep-disorders/features/adult-sleep-needs-and-habits, "some people say they can function on four to six hours of sleep each night, but research show that adults who get fewer then seven hours of sleep whether for just one night or over the course of days, weeks, or months have more difficulty concentrating and more mood problems then people who sleep seven to nine hours. Babies can sleep through a circus. Older kids may fight bedtime. And teens good luck getting them lout of bed on a weekend. But what about you grown up? Your sleep life is still changing and not just because time is passing. How does sleep work in adulthood? Does it change for better or worse as we age? And why do we fell like we never get enough of