It's one of the first warm days of the year. The first harbingers of spring are cautiously poking their heads out of the ground, the cappuccino in the street cafe tastes of new beginnings. Winter seems to be over. Everything seems easier — if only it weren't for that one feeling that seems to plague many people (at least in the German-speaking countries) every year: spring fatigue. In German, spring fatigue is known as Frühjahrsmüdigkeit . But — and this may be good news for some — researchers from the University of Basel and the University Hospital of Bern in Switzerland say there is no empirical evidence of spring fatigue . "We found that people are not measurably more fatigued or tired during spring than any other season," said the study's co-author Christine Blume, a psychologist and sleep researcher, in conversation with Gabriel Borrud and Conor Dillon of DW podcast Science Unscripted. "You find all these potential explanations out there," said Blume.…