Working the night shift as a young adult probably doesn’t seem that bad, right? You’re young and energetic, the hours give you plenty of free time during the day — what’s not to like? Well, a new study finds all of these night shifts and irregular schedules can affect your health decades later. A researcher from New York University finds that “volatile work schedules” in your 20s can lead to sleep issues and poor physical and mental health by age 50.