How Much Sleep Do You Need? 8 Hours Isn’t for Everyone
I’ve been particularly looking forward to the sleep chapter in John Medina’s book Brain Rules (one of my current reading books) because I was interested to know once and for all how much sleep I needed. Was 8 hours really the magic number? What were the consequences of averaging, say, 7 hours, or 6? What about naps? I was interested in knowing how sleep affects our brains so that I could begin to see how it might affect self-motivation. The answers were very helpful in some ways and completely unhelpful in others. What are the findings about how much sleep we need? Research so far seems to say that there is no definite number, and sleep needed varies widely from person to person. Some people (who have a condition called “healthy insomnia”) only need 4 or 5 hours a night and don’t seem to suffer any ill effects. Kids going through puberty definitely need more, preferably in the morning. There also seem to be genes that determine whether someone is a morning person (a “lark”), a night owl, or (like most of us) a “hummingbird,” which is to say someone with a “normal” sleep schedule. Sleep needs and daily schedules change as a person ages, too. Too little sleep has serious costs
But one very clear finding across the board is that not getting enough sleep actively sabotages the brain’s abilities. As Medina puts it, “Sleep loss hurts attention, executive function, immediate memory, working memory, mood, quantitative skills, logical reasoning ability, general math knowledge … manual dexterity … and even gross motor movements.” Also, interrupted sleep or inadequate sleep severely limits our ability to remember things we learned that day, increases stress, and causes effects that mimic accelerated aging. Not getting enough sleep even forces the body to crave sugar while reducing our ability to make good use of sugar when we get it, playing havoc with healthy eating. Figuring out your own sleep needs
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