crying again

My son just came home from school and he is very happy. But this morning when I woke him up to get ready he was crying he does want to go to school again. Almost every morning he is lazy to get up. I hope he will stop crying in the morning. I always tell him he needs to go to school to learn. Sometimes he is good with no crying but often time he cries. I think most kids are like that right? He is only four years old anyway and in Pre K.