---
title: Why Do We Sleep? — HIGH T3CH
url: https://hight3ch.com/why-do-we-sleep/
date: 2013-08-19
---

# Why Do We Sleep?

Russell Foster is a circadian neuroscientist: He studies the sleep cycles of the brain. And he asks: 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, 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.