In his famous hadith collection, Abu 'Eesaa al-Tirmidhi mentioned: [قَالَتْ عَائِشَةُ كَانَ النَّبِيُّ صلى الله عليه وسلم لاَ يَنَامُ حَتَّى يَقْرَأَ بَنِي إِسْرَائِيلَ وَالزُّمَرَ] 'A'ishah said: The Prophet would not sleep until he had recited surah Banu Israa'eel [i.e. surah al-Isra'] and surah al-Zumar. [Jaami' al-Tirmidhi

. Also included in al-Albani's Silsilah al-Sahihah

with a grading of 'jayyid' - 'good'.] Commenting on this in his explanation of Jaami' al-Tirmidhi, al-Mubarakfoori wrote: [أي لم يكن عادته النوم قبل قراءتهما ] Meaning that it wasn't typical for him to sleep before having recited these two surahs. [Tuhfah al-Ahwadhi 8/191]