If you're stressing out about something specific, you know what's causing you to lose sleep. When you don't know what's causing it, the stress only increases like a snowball rolling downhill. This TED-Ed lesson from Dan Kwartler goes into the mechanisms that disrupt your normal sleep cycle. -via Digg
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An old talk that breaks down the motivations behind gaming:
http://www.youtube.com/watch?v=KyamsZXXF2w
Thanks for the link, Joanna! That TED talk by Tom Chatfield was very interesting.