Hudhayfah ibn al-Yamān (may Allah be pleased with him) reported: When the Prophet (may Allah's peace and blessings be upon him) intended to sleep, he would place his hand under his head, then say: "Allāhumma qini ‘adhābaka yawma tajma‘u or tab‘athu ‘ibādak (O Allah, protect me from Your punishment on the Day You gather or resurrect Your servants)."

‘Ā’ishah (may Allah be pleased with her) reported: When the Prophet (may Allah’s peace and blessings be upon him) went to bed every night, he would join his palms together and blow into them and recite the Surahs al-Ikhlās, al-Falaq, and an-Nās, and then he would wipe with his hands over as many parts of his body as he could, starting with his head, face, and the front of his body. He used to do that three times.

Abu Qatādah al-Ansāri (may Allah be pleased with him) reported: When the Messenger of Allah (may Allah's peace and blessings be upon him) encamped to sleep at night during a journey, he would lie down on his right side, and when he wanted to sleep before dawn, he would extend his forearm and place his head on his palm.