Reference : Hisn al-Muslim 110

يقرأ ((ألم * تنزيل)) السجدة،
و((تبارك الذي بيده الملك))
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Recite Surah 32 (As-Sajdah) and Surah 67 (Al-Mulk) in Arabic.

Reference:
At-Tirmidhi, An-Nasa'i. See also Al-Albani, Sahihul-Jami ' As-Saghir 4/255

Chapter: Before sleeping