As-salamu alaikum wa Rahmatullahi wa Barakatoh,
Imām Muhammad ibn ‘Alī al-Baqir (alayhi salām) said:
"If anyone recites the surahs known as Musabihaat i.e. Surah Hadid, Hashr, Saf, Juma, Taghabun and A'ala before sleeping, he will not die until he is blessed with the ziyarat of Imām Mahdi (alayhi salām). And, if he is to die without being blessed with his Ziyarat, then he will stay in the neighbourhood of the Holy Prophet (salla llāhu ʿalayhi wa-alehe wa-sallam)”
[Reference: Mafatih-ul-Jinan, Shaikh Abbas Qummi]