Researchers know some physical reasons to explain sighing but are lost about its relationship to our emotions — So, apparently, I sigh a lot. Over the years, I’m frequently asked by friends, roommates, coworkers, and acquaintances whether I’m okay. They often interpret my sighs as annoyance or frustration, but I always respond, “I’m good, just breathing.” Most of the time, I’m completely oblivious to my sighs until someone…