Studying Western medicine before I got in with bad company has qualified me to diagnose the real cause: his overconsumption of German white beer. But who can blame him? The remedy I'm prescribing is an old German Taoist cure called Franziskaner Weissbier Dunkel, literally "dark white beer". It's the best way to get some balance into your life.
I'll be making housecalls over on his side of the island, to make sure he takes the medicine daily. He has a habit of saving it all up for a big binge at the weekend. No wonder he thinks every weekend lasts 5 days.