An irregular sleep cycle seems pretty mild compared to super space bacteria, a weakened immune system, and problems with radiation. http://boingboing.net/2013/

An irregular sleep cycle seems pretty mild compared to super space bacteria, a weakened immune system, and problems with radiation. http://boingboing.net/2013/01/07/another-danger-for-astronauts.html http://boingboing.net/2013/01/07/another-danger-for-astronau... http://boingboing.net/2013/01/04/how-space-radiation-hurts-astr.html http://boingboing.net/2013/01/04/how-space-radiation-hurts-a...