Whenever Allah's Messenger (ﷺ) went to bed, he used to blow on his hands while reciting the Mu'auwidhat ( i.e. Suratal-Falaq 113 and Surat-an-Nas 114) and then pass his hands over his body.
Sahih al-Bukhari Book 80, Hadith 16
← Previous Hadith Fatima complained about the blisters on her hand because of using a mill-stone. She went to ask the Prophet for servant, but she did not find him (at home) and had to inform `Aisha of her need. When he came, `Aisha informed him about it. `Ali added: The Prophet (ﷺ) came to us when we had gone to our beds. When I was going to get up, he said, "'Stay in your places," and sat between us, till I felt the coolness of the feet on my chest. The Prophet (ﷺ) then said, "Shall I not tell you of a thing which is better for you than a servant? When you (both) go to your beds, say 'Allahu Akbar' thirty-three times, and 'Subhan Allah' thirty-three times, 'Al hamdu 'illah' thirty-three times, for that is better for you than a servant." Ibn Seereen said, "Subhan Allah' (is to be said for) thirty-four times."

Sahih al-Bukhari Book 80, Hadith 15 Next Hadith → The Prophet (ﷺ) said, "When anyone of you go to bed, he should shake out his bed with the inside of his waist sheet, for he does not know what has come on to it after him, and then he should say: 'Bismika Rabbi Wada`tu Janbi wa bika arfa'uhu, In amsakta nafsi farhamha wa in arsaltaha fahfazha bima tahfazu bihi ibadakas-salihin."

Sahih al-Bukhari Book 80, Hadith 17