It has been told in Hadith that Prophet Muhammad has said that if every night Surat ul-Mulk is recited, then the reciter shall be protected from the tortures of the grave.
The Prophet (s.a.w) said:
'Surah al Mulk is the protector from the torment of the grave'
[Sahihul Jamiea 1/680, Hakim 2/498 & Nasai]
Read Surah Al-Mulk Every Night.....
Jabir (radiAllahu anhu) said it was the custom of the Holy Prophet sallallahu alaihe wasallam not to go to sleep until he had read Tabarakalladhi Biyadihil Mulk and Alif Laam Meem Tanzeel. [Ahmad, Tirmidhi and Darami]