Francesco Billari

A study of the causal effects of access to high-speed Internet on sleep. Playing video games, using PC or smartphones, watching TV or movies are correlated with shorter sleep duration. The researchers exploit historical differences in pre-existing telephone infrastructure that affected the deployment of high-speed Internet across Germany to identify a source of plausibly exogenous variation in access to broadband. Using this instrumental variable strategy, they find that access to high-speed Internet (DSL) access reduces sleep duration and sleep satisfaction.