Mysterious hum keeping people up all night

http://www.independent.co.uk/environment/nature/mysterious-hum-keeping-people-up-all-night-could-be-mating-fish-8900747.html

http://www.youtube.com/results?search_query=Mysterious+hum+keeping+people+up+all+night+&oq=Mysterious+hum+keeping+people+up+all+night+&gs_l=youtube.3...0.0.0.701.0.0.0.0.0.0.0.0..0.0...0.0...1ac..11.youtube.

http://en.wikipedia.org/wiki/Extremely_low_frequency

http://www.whale.to/b/rifat.html