Use the conversation to answer the question.
MOM: You need to start your homework as soon as you get home from school. You will be too tired to do it later.
ISAAC: I'm tired when I get home from school because I've been paying attention in class and surrounded by people all day. I also have to clean my room and take Boomer for a walk.
MOM: Your homework is more important than cleaning your room and taking Boomer for a walk.
ISAAC: I agree with you. But by the time I get home from school, I've been doing schoolwork for eight hours straight. If I had a break from doing schoolwork to take care of the other things I need to do before starting homework, I think I would be more focused. Also, I always finish my homework. It's important to me that it gets done, too
In one sentence, explain Isaac's reasoning for wanting to do his homework later than his mother would prefer.