Holiday lights may look magical, but they can be dangerous too, and experts say it’s best to switch them off before heading to bed. Modern LEDs are safer than old-school incandescent bulbs, but they can still overheat or overload outlets if they run too long. A few quick safety habits, like checking cords, upgrading aging strands, and keeping connections away from water, go a long way toward preventing trouble. For an easy upgrade, a smart plug can even shut everything off automatically so you don’t have to think twice.