It doesn’t matter whether you find the game exciting or not so long as your brain does, and television is better at engaging those parts of the brain that will keep you awake than radio is. In fact, television affects our brains much differently than most other media (including the internet). The passivity of it allows your body to conserve energy, but the constant movement on the screen keeps your brain alert. In part it is because your brain is quite used to filtering out sound while you sleep, but usually doesn’t have to contend with moving external images. This is not to say that there may be age-related factors, but television is associated with difficulty sleeping in all age groups as far as I know.