It's said that the Chafetz Chaim used to stay up all night after Shemini Atzeret / Simchat Torah. This being an unusual custom (many stay up all night on Shavuot, and some the night of Hoshana Rabba, but after Simchat Torah???) he was asked why.
He responded, "it's been a whole week since I've had a chance to be able to put on tefillin" (tefillin are a daily mitzvah for men that many have the custom of not doing during Chol HaMoed Succot and Pesach). "How can I not stay up and be ready at the earliest moment?" (The earliest moment being immediately as dawn breaks.)
BS"D - בסיעתא דשמיא