Do Sheep Dream Of Electric Androids?

Masem writes: "The NYTimes (free reg req) has a story on work that is being done to determine whether animals dream. The evidence for brain activity and REM is there, but researchers have now found that with 4 test mice which have run a maze several times, their brain activity while they sleep strongly mimiced that of when they are running that particular maze, as opposed to brain patterns when doing other tasks including running a different type of maze. It suggests that the biological function that controls dreaming is related to memory somehow."