We spend about a third of our lives sleeping—but the exact number of hours we log in any given day changes a lot depending on our age. Newborns, for example, sleep about 14 to 17 hours out of every 24, while teens and adults require different amounts. Here's what you need to know about sleep needs over the arc of your life.
If you were forwarded this and want to sign up to receive it daily, click here. Today's newsletter was written by Jeffrey Kluger and edited by Angela Haupt.
