Siyum on tractate Tanis. Discussion of the statement that one who increases Torah study at night beginning from Tu B’Av will have his life extended:

Isn’t a person always obligated to use every available moment for Torah study? If he now studies more at night, does that simply mean that he was previously studying more during the day?

Also, what exactly is the “Crown of Torah,” and why does the Rambam say that a person merits it specifically through studying Torah at night?