Harvard Health Letter
How much sleep do we really need?
How much sleep do we really need? Ask the doctor Q. How much sleep do we really need, and what happens if we get too little or too much? A. We spend about a third of our lives sleeping, so you’ve asked an important question. The National Sleep Foundation recommends seven to eight hours of sleep for people over age 64 and seven to nine hours for ages 18 to 64. Kids need more sleep.