By David Sixty percent of Americans watch television before going to sleep at night, but certain TV shows are viewed more than others, according to a new survey. Sleep experts at Bestmattress-brand conducted a survey that also found that 50 percent of Americans watch TV five to seven days a week as part of the bedtime routine. Cartoons made up four of the top six TV shows watched by Americans before bedtime. Animated sitcom creator Seth Macfarlane holds the top two spots, according to the survey. “Family Guy” (20.2 percent) and “American Dad” (17.1) are the top two most watched shows before be…