The Ottawa Citizen reports on a 3-week sleep study of 13 Canadian Armed Forces members in the Arctic.

Canadian Forces Station Alert, located on the northern tip of Ellesmere Island, is the perfect place to study the effects of round-the-clock darkness on sleep habits and circadian rhythms. From mid-October to late February the sun does not rise above the horizon at this most northerly, permanently inhabited location in the world, and total darkness lasts from the end of October to mid-February.