We examine the individual- and country-level factors that contribute to the risk of working unsocial hours in 30 European countries. Using the EU labor force survey data, we test for the influence of labor market dualization, product- and labor market regulation, and collective bargaining on the individual risk of working unsocial hours. The risks of working unsocial hours are strongly dualized in all countries, but the size of the risk gap between low-skilled outsiders and high-skilled insiders varies. In countries where collective bargaining plays a greater role in regulating work hours the gap between low- and high-skilled workers is smaller.