“Human beings are the only species that will deliberately deprive themselves of sleep without legitimate gain.” - Matthew Walker, PhD (Author of " Why We Sleep ") Sleep is a big issue for many people. Some have difficulty sleeping because they are in pain. Others have difficulty quieting their mind at night. Regardless of the cause, a lack of sleep can have some pretty damaging effects. I think we all sort of have a sense that sleep matters , but perhaps not how much or why, so let's go over what some of the research says about sleep. First of all, the average adult human needs 7-9 hours of sleep each night . This does not mean you should go for 5 days with only 5 hours of sleep and then try to "catch up" on the weekend by sleeping half the day so that your average sleep is 49 hours for the week. While this may work...