Hadithcore
Mishkat al-Masabih, 2155

Jabir said it was the Prophet’s custom not to go to sleep till he had recited “<i>A. L. M</i> The sending down,” (Qur’ān, 32) and “Blessed is He in whose hand is the kingdom.” Ahmad, Tirmidhī and Dārimī transmitted it, Tirmidhī saying this is a <i>sahīh</i> tradition. The same is said in <i>Sharh as-sunna</i>, but in <i>al-Masābīh</i> it is called <i>gharīb</i>.

وَعَنْ جَابِرٌ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ لَا يَنَامُ حَتَّى يَقْرَأَ: (آلم تَنْزِيل) و (تَبَارَكَ الَّذِي بِيَدِهِ الْمُلْكُ) رَوَاهُ أَحْمَدُ وَالتِّرْمِذِيُّ وَالدَّارِمِيُّ وَقَالَ التِّرْمِذِيُّ: هَذَا حَدِيثٌ صَحِيحٌ. وَكَذَا فِي شرح السّنة. وَفِي المصابيح

References1 variant
In-Book Reference
Book 8, Hadith 45