A cause I could get behind: Staying in bed longer during the winter to conserve energy.
But to accept the life described in this op-ed, you'd have to accept a life with five months of working much, much harder than I ever have, and seven months of monotony. Also, in general, a life with a much narrower range of experiences. I'm thinking in terms of food--you would eat just what you grew or your neighbors grew, travel (no money economy = no travel, I think), and leisure (no taking out books from the public library). These are all things that I take for granted and would be very sad without, even if it meant that I could spend seven months of the year sleeping.