Catnip for the frazzled, wired-but-tired generation, “nervous system regulation” has become one of this year’s biggest wellness pursuits. If those extolling the benefits of nervous system regulation are to be believed, it could be our ticket to healthier, happier lives. The sympathetic nervous system governs our fight-or-flight response, while the parasympathetic is responsible for rest-and-digest. “You’re ready to fight or flee when it’s just that your boss wasn’t pleased with some work you did.” Tracking heart-rate variability (HRV) through devices such as an Oura Ring or Apple Watch can also offer insight into your nervous system state.