Encyclopedia of Prophetic Hadiths

"When any of you performs ablution, let him sniff water in his nose and then blow it out. Whoever cleans his private parts with stones, let him do so with an odd number of stones. Whoever wakes up from his sleep, let him wash his hand before putting it in the water container of ablution, for none of you knows where his hand was during his sleep." The wording of Muslim reads: "Whoever wakes up from his sleep, let him not put his hand in the water container until he washes it three times, for he does not know where his hand was during his sleep."

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.

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)."