Some Instruction about Salaah
1. Hadrat Umar (Radi Allahu Ta’ala Anhu) narrated ALLAH’s Messenger as saying, Should anyone falls asleep and fails to the perform supplication such as prayers which he normally made in the night, if he performs it between the dawn and the noon Salaah (Zuhar Salaah) it will be recorded for him as though he had recited it during the night. [Muslim]
2. Bismillah should be said if a (complete) surah is recited after surah al-Fatihah in the Salaah and if only a ruku (part of a surah) is recited, Bismillah need not be said. [Bahishti Zewar]