My long running obsession is my family tree. I’m not obsessed with it all the time but it flares up every few months. This would be fine but at the moment I am severely behind on my history coursework. This presents a problem as while I can work days on end on my family tree, I get distracted after about two minutes on my coursework (mainly by thinking about family tree stuff). So unfortunately I have had to ban myself from my family tree for the time being and hope that I get mildly obsessed with my coursework topic in the meantime.