The ability to record a sleeper's dreams as video may sound far fetched, but recent technologies may pave the way for such a possibility.

Check out this article and video on a neckband that translates thought into speech by picking up nerve signals. This technology is still in it's infancy, limited to a 150 word vocabulary, but I feel it's certainly a step in the right direction.
http://technology.newscientist.com/c...thic-chat.html