You should know how to combine work and rest. Regardless of study or work, the combination of work and rest is very important, it can make people and work twice the result with half the effort. If you overwork your work, it will not only affect your health, but will also reduce your work efficiency. If you feel that a long sleep time does not improve efficiency, you should try to spread the sleep, fix the number of hours at night, and how long to rest at noon, maybe you can change your current situation.