Quoting%20commentary for Megillah 39:13

והא ביממא לא מצי טבלה דכתיב (ויקרא טו, כו) כל ימי זובה כמשכב נדתה יהיה לה בליליא מיהת ליעביד מקצת שימור ותיטבול קמ"ל כיון דבעיא ספירה

This woman, however, cannot immerse on that day, because it is written, “All the days of her discharge she shall be as in the days of her menstrual impurity”; (Leviticus 15:26) so [you might say], by night at least she might keep watch for a short time and then immerse; therefore we are told that [she must not do this], because she requires to count [day for day];

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