What do you mean it's hard to understand in the early morning?

In the morning, I feel sad, and it is difficult to understand and explain this sad mood. In the wee hours, it is difficult to understand the feeling of love. Half is to express the feelings of parting, and the other half can only be fully expressed by themselves. The whole sentence means that some emotions are difficult to express, and only he can understand them, and this kind of emotion is deeper and more difficult to send away in the morning. In the morning, I feel sad, and it is difficult to understand and explain this sad mood.