What is the virtue of reciting the Musabbihat surahs every night, and must they be recited all at once or surah by surah?

Reading the Surahs of the Musabbihat (Al-Isra, Al-Hadid, Al-Hashr, As-Saff, Al-Jumu'ah, At-Taghabun, Al-A'la) before sleep is a confirmed Sunnah of the Prophet, peace and blessings be upon him. It is reported that he said: "Verily, there is an verse within them that is better than a thousand verses." It appears that this reading encompasses all the Musabbihat surahs every night, so as not to miss the intended verse, which is said to be "Had We sent down this Qur'an" or the third verse of Surat Al-Hadid.