Air, water, food — and some would argue sex — are key ingredients to human survival. In reality, there should be another “S” word in that list: sleep.We’re supposed to get between seven and 10 hours of sleep each night, depending on our age, but the U.S. Centers for Disease Control and Prevention says that a third of Americans sleep fewer than seven hours a night. It’s a global problem too.”Sleep problems constitute a global epidemic that threatens health and quality of life for up to 45% of the world’s population,” according to the World Sleep Society, a nonprofit organization of sleep professionals dedicated to advancing “sleep health worldwide.”Yet how does anyone get to sleep today in the turmoil over the coronavirus pandemic? Workplaces and schools are shutting down, meaning hourly workers are without paychecks if they can’t work and children used to free lunch are not getting fed —