Like Biker395, I do 35 miles a day, six days a week and ride at about the same speed he does but I tend to add intervals in my daily rides. I often fall asleep at night, while watching TV, but it isn't from my diet, but from not being able to fall back to sleep after getting up to use the bathroom. When I do get to sleep late, I don't fall asleep watching TV. Not sure what your sleep habits are, but you may want to start tracking the number of hours that you sleep to see how much that factors into your problem.