I stopped eating breakfast when I discovered it made me wake up too early. My Tsinghua students are reading the paper in which I describe my breakfast research. One of them, a freshman, wrote:
When we [entered] Tsinghua University, the first task we should finish was the military training. [New students have a few weeks of military training.] We were asked to be gathered at 8 o’clock, and then we would do a lot of trainings. As the training was hard and tiring, we all had to eat breakfast in the morning. And I remembered in those days, we all slept well and were early-awakening. When the trainings were over, we began our classes. The time was also 8 o’clock, but many times we didn’t have breakfast in order to save time. Gradually, our awakening time become later and later. Even we set an alarm clock, we felt really reluctant to get up. For a long time, we wondered about that but no idea appeared. Now I got the answer, it has something to do with the breakfast. When I told my roommates, they were indeed surprise. Everyone was curious about why, and I was also interested in that. Maybe if the last day you had breakfast, the next morning your body will still have the motivation to call you up to eat breakfast.
Yes, if you eat at a certain time of day, you will tend to be awake that time of day. The effect has been heavily studied in animals, where it is called anticipatory activity.