When you land a good mattress deal, you’re buying more than a place to lay your head—you’re also investing in your health. Sleep occurs in a series of stages that repeat in several cycles throughout the night. Disruption to any of these stages can lead to a laundry list of health woes, from obesity to depression to heart disease. A San Francisco mattress company created this infographic to explain the stages of sleep and how to get the right mattress for uninterrupted rest. Everyone you know could probably benefit from this information, so please pass it along.