“Surah Mulk” is the 67th chapter in the Holy Quran and it consists of 30 verses. There are two significant benefits one would attain by reading these 30 verses regularly or more specifically at night before sleeping.
1. Intercede for One Who Recites
Anyone who recites this Surah regularly for the sake of Allah, learn its teachings and implements on it, will have it intercede for him in the hereafter. Hadith says it will intercede until that person is forgiven. To attain this benefit one may recite this Surah any time of the day and not specifically at night.
Abu Hurairah (May Allah be pleased with him) reported: I heard the Messenger of Allah (ﷺ) saying, “There is a Surah in the Qur’an which contains thirty Ayat which kept interceding for a man until his sins are forgiven. This Surah is ‘Blessed is He in Whose Hand is the dominion.’ (Surat Al-Mulk 67).” At-Tirmidhi and Abu Dawud
Yahya related to me from Malik from Ibn Shihab that Humayd ibn Abd ar-Rahman ibn Awf had told him that Surat al-Ikhlas (Sura 112) was equal to a third of the Qur’an, and that Surat al-Mulk (Sura 67) pleaded for its owner. Muwatta Malik Book 15, Hadith 19
Prophet (ﷺ) said: “Indeed there is a Surah in the Qur’an of thirty Ayat, which intercedes for a man until he is forgiven. It is [Surah] Tabarak Alladhi Biyadihil-Mulk.” – Tirmidhi 2891
2. Protection from the Punishment of the Grave
Reciting this Surah every night, before going to sleep will protect oneself from the torment of the grave.
Jabir said, “The Messenger of Allah, may Allah bless him and grant him peace, did not sleep until he had recited, ‘Alif-Lam-Mim – The Sending-down’ (Surah Sajada 32) and ‘Blessed is the One in whose hand the kingdom is’ (Surah Mulk 67). Al-Adab Al-Mufrad Book 1, Hadith 3
It was narrated that Abd-Allah ibn Masood said: Whoever reads Soorat al-Mulk every night, Allah will protect him from the torment of the grave. At the time of the Messenger of Allaah (peace and blessings of Allah be upon him), we used to call it Al-Maaniah (that which protects). In the Book of Allah, it is a Surah which, whoever recites it every night has done very well – IslamQA
To conclude, one should make all possible efforts to recite this Surah every night before going to sleep. As mentioned above, this Surah consists of only 30 verses which will only take a few minutes to read. Spending a few minutes to reap these immense benefits indeed shows the mercy of Allah (SWT).
And Allah knows best.