I could relate to this idea, as I too had difficulty in High School getting to bed early. It is interesting how educators know that this is in fact a biological phase in a child's life. We have learned in various courses that children retain most of their information earlier in the morning. It would seem logical to me that those students whose biological clock has them going to bed earlier, should be the ones to start school earlier. Eating and drinking also affects student performance.
Healthy foods contain vitamins and minerals that are essential for learning.
Students who eat meals rich in vitamins and minerals can boost their learning and intelligence. Eating is important at this age because the brain is maturing and creating myelination that is important for growth and future health. When students are dehydrated there is a definite loss of attentiveness. Dehydration can occur quickly as the brain takes up the highest percentage of water over any other organ. Sleep, and lack of food and water can affect discipline and motivation for students in a classroom.