Russell Foster: Why Do We Sleep?

What do we know about sleep? Not a lot, it turns out, for something we do with one-third of our lives. In this talk, Russell Foster shares three popular theories about why we sleep, busts some myths about how much sleep we need at different ages — and hints at some bold new uses of sleep as a predictor of mental health.

About the Author

Russell Foster

Russell Foster studies sleep and its role in our lives, examining how our perception of light influences our sleep-wake rhythms.