Is there life elsewhere in the universe, or in the solar system? Methane on Mars suggests life, but: - http://sciencenow.sciencemag.org/cgi/content/full/2009/805/2 - And on a much lighter note: - http://www.newscientist.com/special/ten-mysteries-of-you - But I have watched my dogs dreaming, leg movements and soft barks while sleeping.