Urgent appointments, tight work timetables and hectic social schedules structure modern life, and they very often clash with our intrinsic biological rhythms. The discrepancy results in so-called social jetlag, which can damage one's health. Among other effects, it can contribute to the development of obesity, as a new study lead by chronobiologist Professor Till Roenneberg from Ludwig-Maximilians-Universität (LMU) in Munich shows.