Hisnul Muslim · Dua 110 of 267
What to say before sleeping
((يَقْرَأُ ﴿الم﴾ تَنْزِيلَ السَّجْدَة ِ، وَتَبَارَكَ الَّذي بِيَدِهِ الْمُلْكُ)).
English meaning
The Prophet never used to sleep until he had recited Soorat As-Sajdah (chapter 32) and Soorat Al-Mulk (chapter 67).