The sun is shining, the days are growing longer and the open-air season has begun. It is spring, but not everyone feels energetic. For some, it is a season of leaden limbs and fits of yawning, especially after the switch to daylight saving time.

 

"Springtime lethargy is a vegetative reaction to the changes in nature," said Angela Schuh, a professor of medical climatology at the University of Munich.