This is a Meccan & last surah of the holy Quran. Surah an-Nas and Surah al-Falaq are together called Al-Mu\'awwidhatayn. Imam Jaâfar as-Sadiq (as) has said that whoever recites this surah in his house every night, will be kept safe from Jinnaat and the evil designs of Shaitan (la). If this surah is put around the neck of a child as a talisman, the child will be protected from Jinnaat. Reciting al-Mu\'awwidhatayn before sleeping is a means of safety and if recited on any paining part of the body, the pain will be relieved. (by will of ALLAH swt)