Whenever the Messenger of Allah (may Allah’s peace and blessings be upon him) went to his bed, he would blow into his hands, recite the Mu‘awwidhāt, and then pass his hands over his body

‘Ā’ishah, the Mother of the Believers, and the wife of our Prophet (may Allah's peace and blessings be upon him) in this world and in the Hereafter, related to us this noble act of Sunnah. She told us that every night, when the Prophet (may Allah's peace and blessings be upon him) went to bed, he would blow into his hands mildly, short of spitting, and recite into them Sūrat al-Ikhlās, Sūrat al-Falaq, and Sūrat An-Nās. As the Hadīth does not clearly indicate which should be done first, one may blow first and then recite, or recite first and then blow. Then, he would pass his hands over as much of his body as he could reach, beginning from his head, face, and the front of his body. He would do all this three times.