Before I sleep, I usually do my math homework.
It is because I can gain my full attention at night.=  focus better at night.
Also, doing my math homework makes me tired, so I can sleep well at night.
After I do my homework, I sometimes take a shower, and go to bed.

Evalaution: You have a clear and logical routine, and your ideas are easy to understandTo improve, focus on more natural expressions like “focus better” instead of “gain my full attention,” and smoother sentence linking. However, you are doing well in organizing your thoughts, keep practicing to make your English more natural and fluent.