In another study of blue light, researchers at the University of Toronto compared the melatonin levels of people exposed to bright indoor light who were wearing blue-light–blocking goggles to people exposed to regular dim light without wearing goggles. The fact that the levels of the hormone were about the same in the two groups strengthens the hypothesis that blue light is a potent suppressor of melatonin. It also suggests that shift workers and night owls could perhaps protect themselves if they wore eyewear that blocks blue light. Inexpensive sunglasses with orange-tinted lenses block blue light, but they also block other colors, so they're not suitable for use indoors at night. Glasses that block out only blue light can cost up to $80.
Although adults tend to view video games as isolating and antisocial, other studies found that most young respondents described the games as fun, exciting, something to counter boredom, and something to do with friends. For many youths, violent content is not the main draw. Boys in particular are motivated to play video games in order to compete and win. Seen in this context, use of violent video games may be similar to the type of rough-housing play that boys engage in as part of normal development. Video games offer one more outlet for the competition for status or to establish a pecking order.