The ruling on one who sees the trace of a nocturnal emission after several days have passed

Question:
A man saw the trace of a nocturnal emission on his garment and remembered that he had seen in his dream what caused this four or five days ago. He did not know that he had a nocturnal emission and was unaware of it, and he had performed several prayers. When he saw this trace, he performed the full ritual bath. What is required of him? Does he have to repeat the prayers he performed during this period while he was unaware?

Answer:
If he knows that it is semen, he has to repeat the prayers after the last sleep he took, because that is the certain point. For example, if he saw it in the afternoon, and his last sleep was in the morning, he repeats the midday and afternoon prayers. If his last sleep was in the midday, and he did not see it until after the afternoon, he repeats the afternoon prayer, and so on. That is, from the last sleep he took, if he then saw the semen, he repeats the prayer after that sleep, because it appears that it came from the last sleep, and he does not generalize it to the previous sleeps.