Sure, smartphones and tablets make it easier to keep tabs on your inbox and fantasy leagues, but experts say being constantly connected comes at a cost. In theory, if you’re available at all times, you can do what you need to do on your own schedule, leaving more free time overall, explains David Greenfield, Ph.D., director of the Center for Internet and Technology Addiction and assistant clinical professor of psychiatry at the University of Connecticut School of Medicine. But the research has actually come out the other way around—being logged on 24/7 leaves people with less time, they are less productive, and they are more stressed than ever, he says. “You never have any down time because you always have your device with you.”

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What’s more, technology overuse can be hazardous to your health, contributing to eye strain, poor sleep, obesity, and even cancer. Read on for a closer look at these dangers—and how to stage a digital detox.