Ruling on standing up to do sajdat al-tilaawah
Question

                If a person is reading
      Qur’aan sitting down in the mosque or elsewhere, and he reaches an ayah where a
      sajdah is prescribed, is it better for him to stand up to do the sajdah, or should he
      prostrate from his sitting position? Which is better?
Praise be to Allah.We know of no evidence (daleel) to suggest
    that he should stand up in order to do sajdat al-tilaawah.
And Allaah is the source of strength. May Allaah bless our
    Prophet Muhammad and his family and companions.