If you keep your horses at home, you probably do a final barn check before bedtime. I know I do. Of course, when I enter the barn, the first thing I do is flip on the lights. In response, my horses blink away at me, looking a little dazed. I always feel a little uneasy about disturbing their rest this way. And I have often wondered how long it takes for them to return to a restful state once I’ve left for the night.
“You are right to give this serious thought,” says Barbara Murphy, BScEq, PhD, GDipUTL, associate professor at the University College Dublin in Ireland. “Horses are much more sensitive to light disruptions than are humans. Abrupt exposure to light at night—like the one your horses experience when…