Learning about Moshiach on Tisha B’Av



I was wondering if it is permitted to learn past Chatzos on Erev Tisha B’Av, and/or on Tisha B’Av itself if it’s about Moshiach? For example, learning the Sichos from Nun Alef and Nun Beis?



See in the Sichos you mention – Sefer Hasichos Nun Alef chelek beis page 691 footnote 87 – that the restriction applies also to Hilchos Beis Habechirah (and the same is true regarding learning Moshiach and Geulah).