Recite Surah Al-Kafirun
Farwah bin Nawfal (ra) narrated that:
He came to the Prophet (ﷺ) and said: “O Messenger of Allah, teach me something that I may say when I go to my bed.” So he said: “Recite: Say: ‘O you disbelievers’ for verily it is a disavowal of Shirk.” Shu`bah said: “Sometimes he would say: ‘One time’ and sometime he would not say it.” (Another chain) from Farwah bin Nawfal, from his father: "That he came to the Prophet (ﷺ)" then he mentioned similar in meaning. And this is more correct. [Abu `Eisa said:] And Zubair reported this hadith from Ishaq, from Farwah bin Nawfal, from his father from the Prophet (ﷺ), with similar wording. This is more appropriate and more correct than the narration of Shu`bah. The companions of Abu Ishaq were confused in the narration of this hadith. This hadith has been reported through routes other than this. `Abdur-Rahman is the brother of Farwah bin Nawfal.
Grade: Hasan(Darrusalam)
Jami' At-Tirmidhi 3403
Recite the last two verses of Surah Baqarah
Narrated Abu Mas'ud:
The Prophet (ﷺ) said, "If somebody recited the last two Verses of Surat Al-Baqara at night, that will be sufficient for him."
Sahih Al-Bukhari 5009
Recite Ayatul Kursi
Narrated Abu Huraira:
Allah's Messenger (ﷺ) ordered me to guard the Zakat revenue of Ramadan. Then somebody came to me and started stealing from the foodstuff. I caught him and said, "I will take you to Allah's Messenger (ﷺ)!" Then Abu Huraira described the whole narration and said: That person said (to me), "(Please don't take me to Allah's Messenger (ﷺ) and I will tell you a few words by which Allah will benefit you.) When you go to your bed, recite Ayat-al-Kursi, (2.255) for then there will be a guard from Allah who will protect you all night long, and Satan will not be able to come near you till dawn." (When the Prophet (ﷺ) heard the story) he said (to me), "He (who came to you at night) told you the truth although he is a liar; and it was Satan."
Sahih Al-Bukhari 5010
Recite Surat Al-Ikhlas, Surat Al-Falaq and Surat An-Nas, cup your hands blow into it. And do this another 2 more times. Total 3 times.
Narrated 'Aisha:
Whenever the Prophet (ﷺ) went to bed every night, he used to cup his hands together and blow over it after reciting Surat Al-Ikhlas, Surat Al-Falaq and Surat An-Nas, and then rub his hands over whatever parts of his body he was able to rub, starting with his head, face and front of his body. He used to do that three times.
Sahih Al-Bukhari 5017
if you cant read arabic i can give you the transliteration. for the verses and surah mentioned above.