Hazrat Amirul Momeneen (a.s.) has said that if one recites the following Ayat before going to sleep, noor will spread from his bed to Holy Kaaba and from there to BaitulMuqaddas. Then he added that angels will remain around the noor till morning and they will pray to Allah (s.w.t.) to forgive his sins.
Hazrat Imam Jaffer Sadiq (a.s.) has said that if one goes to sleep after reciting the ayat, he will get up at the desired time.
BISMILLAHIR RAHMANIR RAHEEM
QUL INNAMAA ANAA BASHARUM MISLOKUM YOOHAA ELAYYA ANNAMAA ELAAHOKUM ELAAHUWN WAAHEDUN, FAMAN KAANA YARJOO LEQAAA-A RABBEHEE FAL YA'MAL A'MALAN SAALEHAN WALAA YUSHRIK BE EBAADATE RABBEHI AHADAA.