Learning at day and night

From Halachipedia
  1. It’s important to learn at night and not waste it all with sleep, eating, and talking because one accomplishes most of his learning at night [1], that learning is not easily forgotten and is considered like the Avoda of the Korbanot. The joy of Torah is specifically felt for learning at night and Hashem grants a special Chesed for one who learns at night. [2].
  2. There's a special practice to "join the day and night" with learning or davening by learning during sunset and sunrise. [3]
  3. If one has a certain daily schedule of learning and hasn't completed it yet, one should finish it at night. However, preferably one should make a stipulation not to accept the daily schedule as a neder, but rather bli neder incase one misses a day. [4]

References

  1. Rambam (Talmud Torah 3:13). S"A 238:1 rules this with the language one must be very careful to learn torah at night, more careful than the day!
  2. Avoda Zara 3b
  3. Yalkut Yosef (Kitzur S"A 1:6), Bear Hetiev 238:1, and Mishna Brurah 1:2 in of the Shlah HaKadosh
  4. S"A 238:2, Mishna Brurah 238:5