On October 26th, the residents of Earth’s northernmost town, Longyearbyen, Norway watched the sun set and the next time they see it will be February. 

Depressing?  Science says Seasonal Affective Disorder exists and so a shortened day much less a non-existent one is bad.   Longyearbyen is located at 78 degrees north latitude in the Arctic circle and experiences 'Polar Night', when it remains dark for four months each winter.    It's not healthy.

So Philips is conducting an experiment there - light therapy, in the form of a Wake Up Light that simulates sunrise.