Sayyiduna al-Irbad bin Sariyah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) used to recite the Musabbihat (the surahs that begin with "Sabbaha" or "Yusabbihu") before sleeping, and he said: "Among them is a verse that is better than a thousand verses."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15716