# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2013-09-07 18:45:17 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/376415893980725248) TED Talk: Why do we sleep? <- As someone who gets an about 4 hours sleep a night this was really interesting http://t.co/aZKhIu8zjr