what is the correct way to recite the 3 quls before sleeping?

Imam Ibn Bāz said: “However, for a person to do as the Prophet did is better — that he recites Sūrat al-Ikhlāṣ and the two Muʿawwidhatayn (Sūrat al-Falaq and Sūrat al-Nās), then wipes [his body], and then repeats their recitation. This is what is most complete: three times.”