Research suggests that you should put away your smartphone at the end of the work day in order to be more productive the following day. Michigan State University business scholar, Russell Johnson and colleagues discovered that workers that tried to continue working on their smartphone past 9:00 p.m. were more worn out and less engaged during the following work day. “Smartphones are almost perfectly designed to disrupt sleep,” said Johnson, MSU assistant professor of management who acknowledges keeping his smartphone at his bedside at night. “Because they keep us mentally engaged late into the evening, they make it hard to detach from work so we can relax and fall asleep.”According to research, at least 50{c754d8f4a6af077a182a96e5a5e47e38ce50ff83c235579d09299c097124e52d} of U.S. adults own a smartphone. Many of them