SUPPOSE YOU’RE ON the front lines of any bad situation, right there with all its horrors. Maybe you’re a health-care worker in a Covid ward, a firefighter battling runaway forest fires, a soldier in major combat. Even if you witness death after horrible death, the odds are that you will eventually get over whatever trauma you have seen or heard or felt. Humans are by nature resilient and have survived a stream of tragedies throughout history.
Yet if you’re like some people, a few months later, you’re not sleeping much. You feel on edge,
