There are 21 ayaat in this surah and it was revealed in Makkah.
The holy Prophet (s.a.w.) has said that the reward of reciting this surah is so much that the one who recites it will be pleased when he sees it in his Book of Deeds. His inspiration of good deeds (Tawfiq) will also increase.
If recited 15 times before sleeping, one will dream about what pleases him most.
Reciting it in the I’sha prayers, carries the reward of completing a quarter of the holy Qur’an and is guaranteed that the prayers are accepted.