It shows the preparation, by recognizing the importance of learning, through sleeping before on shabbos afternoon rather than Shavuos afternoon. The Haflaah explains that by Korach we find that Moshe Rabbenu said to them, בקר ויודע ה’ את אשר לו, Hashem will inform the one He chooses in the morning, emphasizing the morning. The same as you cannot change day to night, this, my will, you also cannot change. So he asks, when did they want to change day to night? He answers by Kabolas Hatorah. The Jews held that before Kabolas Hatorah they were considered as bnei Noach whose day starts at sunrise but Hashem waited for them as Jews, indicating that the day started for them at alos hashachar. So, when it was day they slept considering it as night.
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