Jabir said, "The Messenger of Allah, may Allah bless him and granthim peace, did not sleep until he had recited, 'Alif-Lam-Mim. The Sending-down'(32) and 'Blessed is the One in whose hand the kingdom is' (67).'" (ID)
English reference (ID): Book 50, Hadith 1207 (ID)
Arabic reference (ID): Book 1, Hadith 1207 (ID)