Summary: <p>If you think it’s difficult to get enough sleep in an age of 24 hours news cycles and the allure of Facebook surfing, consider how hard it must be without the sun…or <em>gravity</em>. <a href="http://www.wired.com/wiredscience/2013/01/sleep-problems-mars-500/" target="_blank">The first of many studies on the Mars500 Project</a> have been released, and it documented the sleeping habits of five men isolated on earth for 520 days.</p><p></p><p></p><p></p>
