As Salām Alaykum Wa Rahmatullāhi Wa Barakātuh,
I remember over three, almost four years ago, a brother, May Allāh have Mercy on him and Forgive him, gave a lecture at the masjid and he mentioned a hadīth that really caught my attention, and recently I decided to find the hadīth that he mentioned just to assure myself that it was authentic and thanks to IslamQA there was a question just dealing with this issue. The fatwa (link is at the bottom) starts off by mentioning a brief history of fabrication of hadīth to make people read the Qur’ān by fabricating virtues for them. And then Shaykh Salih al Munajjid (hafidhullāh) mentions some weak and fabricated hadīth for reading or reciting Sūratul Mulk or Sūrat As Sajdah between Maghrib and ‘Ishā as a vituous act of worship. Here is the excerpt on reading Sūratul Mulk in general and before going to sleep.
“And concerning the virtue of Sūrat al-Mulk, it is narrated that it may be recited when going to sleep or in general. Al-Tirmidhī (2891), Abū Dawūd (1400) and Ibn Mājah (3786) narrated from Abū Hurayrah (may Allāh be pleased with him) that the Prophet (peace and blessings of Allāh be upon him) said: There is a sūrah in the Qur’ān, with thirty verses, which will intercede for its companion [the one who recites it] until he is forgiven: “Tabārak allādhī bī yadīhi’l-mulk (Blessed be He in Whose Hand is the dominion)” [Sūrah al-Mulk 67]. Al-Tirmidhī said: This is a hasan hadīth.
Ibn Hajar said in al-Talkhīs (1/234), “al-Bukhārī stated that there is a problem with it in al-Tarīkh al-Kabīr by noting that it is not known that ‘Abbās al-Jashamī (who is the one who narrated it from Abu Hurayrah) heard it from Abu Hurayrah.”
It was classed as hasan by al-Albānī in some places and as sahīh in others. See: Sahīh Sunan Ibn Mājah, Sahīh Sunan Abī Dawūd. Before him al-Mundhirī said: It was narrated by Abū Dawūd, by al-Tirmidhī, who classed it as hasan and this version was narrated by him, and by al-Nasā’ī, Ibn Mājah, Ibn Hibbān in his Sahīh, and by al-Hākim who said its isnād is sahīh.
Al-Tirmidhī (2892) narrated from Jābir (may Allāh be pleased with him) that the Prophet (peace and blessings of Allāh be upon him) did not sleep until he had recited “Alif‑Lām‑Mīm. The revelation…” [Sūratul Sajdah 32] and “Has there not been over man a period of time…” [Sūratul Insān 76] Classed as sahīh by al-Albānī in Sahīh al-Tirmidhī.”
May Allāh’s Peace and Blessings be upon the Prophet, his family, and companions.