click to enlarge A good night’s sleep gets harder as we age, but that doesn’t mean we’re doomed to being sleep-deprived zombies after 40. Typically starting in midlife, we wake up more often, have trouble falling back to sleep, and rise for the day too early. About 55% of Americans ages 40 to 49 and about 58% of those ages 50 to 64 have “low general sleep health,” which includes not sleeping the recommended seven to nine hours a night, not feeling well-rested and having trouble falling or staying asleep, according to 2023 survey data from the National Sleep Foundation, a nonprofit group. There are many reasons why many sleep troubles hit in middle age, including stress, medical conditions and normal biological changes. Here’s what happens to sleep as we age—and how we can improve our shut-eye. Your ‘sleep architecture’ changes Starting in our 20s, the amount of deep sleep we get during the night starts to decline, says Philip Gehrman, professor of psychology at the University of ...