Ewha’s students suffer from lack of sleep due to first hour classes for their early starts because the classes start very early. Ewha’s first hour classes start at 8 am. It is about an hour earlier than starting hour of other universities’ first hour classes. And most Ewha students who attend first hour classes are pushed compulsory to listen during those classes. Many students who commute for more than an hour have to get up at least 6 am at least to attend the class. Here comes trouble. Students have to wake up early even though they went to bed late last night. So They cannot sleep enough, and they feel sleepy and tired for a day or even days. So As a result, it is hard for them to concentrate on class.
The solution for this problem is simple: delaying starting hours of first hour classes or just allowing students not to attend first hour classes (allowing students to choose whether to take first hour classes or not). Then, the problem will be easily solved. If students have late later first classes or have no first classes, they can have more time sleeping in the morning. They might not get enough sleep yet, but at least they sleep more than before so they will get less tired or will not be tired at all. Therefore, students can concentrate better on classes. Even though classes may finish later, this solution is the simplest way to solve the problem.

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Your grammar is quite good, it's just something I edited to make the sentence sound less awkward. Hope it helps ^^