I suppose it is related to stress. We are more productive when less stressed. Having extra day to rest, do your hobbies, more time with loved ones ... etc __sh

I suppose it is related to stress. We are more productive when less stressed. Having extra day to rest, do your hobbies, more time with loved ones ... etc __should__ contribute to less stress. The extra day is not just about being at work, consider commute and other strings attached to going to work.