Some raise a point against the custom to stay up to learn the entire Shavuos night. They say, ‘Think about it. On Shavuos, you end up doing a lot less learning than any other day in the year. You want to stay up all night, so you rest the day before. Davening starts later and the meal lasts longer, so by the time you start learning you’re already tired. You get so tired through the night that you aren’t thinking straight until the morning comes and after davening you sleep the whole of the next day as well. Surely it is better to go to bed at a reasonable time, get up early the next day and learn through the day?!’
Rav Yitzchak Berkovits answers their claim as follows; it is true that if the goal of Shavuos was to learn as much as possible, it may be better to do as these people suggest, especially in today’s generation where lack of sleep affects us so much. However, the goal of Shavuos is to show an expression of our relationship with Hashem and our love for His Torah.
The goal of Shavuos is not to learn as much as possible, we stay up all night to express how much we appreciate the Torah, and this is achieved through learning with a love and excitement, not by covering the most amount of pages.
It is for this reason, explains Rav Berkovits, that when I am asked what one should learn on Shavuos, I tell them that it is clear that they should learn whatever brings them the most amount of ahavas haTorah, love for the Torah.
(Found somewhere.)
This doesn’t fit the Chok Ya’akov (Orach Chaim 493) or the Tikkun, but it sure sounds like something a Mashgiach would say.