The Prophet ﷺ would not sleep until he had recited Surah az-Zumar and Surah Bani Israil.
كان النبي ﷺ ينام حتى يقرأ الزمر وبني إسرائيل.
Narrated by Tirmidhi (2920), Ahmad (24388), Nasai in Amal al-Yawm wal-Layla (712), Ibn Khuzayma (1163), and Hakim (2/424) through various routes from Hammad bin Zayd, from Abu Lubaba Aqeeli, from Ayesha, and he related it. Its chain is hasan because of Abu Lubaba Aqeeli, whose name is Marwan, and he is hasan al-hadith. The discussion of this is given in detail in the book on supplications and remembrances.