What do we spend a third of our lives doing, even though nobody really knows why? Sleeping! In honor of National Sleep Awareness Week, let's take a moment to learn about the importance of sleep, how to tell if you're getting enough, and what you can do if you're not.
Even though so much time is spent doing it, no one really knows why animals evolved to need sleep. In fact, it seems almost anti-evolutionary for an animal to need to be unconscious for so long. Nonetheless, sleep is one of the most ubiquitous behaviors in Nature, so it's probably pretty important. There are plenty of theories, and some interesting new research, but no definitive answers yet.