Americans have increasingly erratic work schedules and it’s taking a toll on employees. That’s according to a study by a UC Berkeley and a UCSF professor who surveyed workers in food service and retail. Only 20 percent of those surveyed work a regular daytime shift, and two-thirds get their weekly schedule with less than two weeks notice. Study authors say the uncertainty is associated with unhappiness and distress, with nearly half of those surveyed reporting psychological distress, and many more reporting poor sleep. Forum talks about the psychological and physical impact of these unpredictable work schedules.