Still can't quite shake the feeling that your middle school gym teacher is sneaking up behind you on the back of a fiery dragon steed? This video will explain everything you need to know about why your brain dreamt it up. Stupid brain.

Some of the info might be a rehash of what you've heard before, yes. But I haven't seen dream science packed into such an entertaining package since Michel Gondry got crazy with a yarn pony back in 2006. [bestofyt via The Daily What]