Invoking ALLAH for protection as done in the authenticated Sunnah of the Prophet, Peace be upon him

Reciting the last two verses of Soorat al-Baqarah (2: 285-286) every night:

ءَامَنَ ٱلرَّسُولُ بِمَآ أُنزِلَ إِلَيْهِ مِن رَّبِّهِۦ وَٱلْمُؤْمِنُونَ ۚ كُلٌّ ءَامَنَ بِٱللَّهِ وَمَلَٰٓئِكَتِهِۦ وَكُتُبِهِۦ وَرُسُلِهِۦ لَا نُفَرِّقُ بَيْنَ أَحَدٍ مِّن رُّسُلِهِۦ ۚ وَقَالُوا۟ سَمِعْنَا وَأَطَعْنَا ۖ غُفْرَانَكَ رَبَّنَا وَإِلَيْكَ ٱلْمَصِيرُ

(285)

لَا يُكَلِّفُ اللَّهُ نَفْسًا إِلَّا وُسْعَهَا ۚ لَهَا مَا كَسَبَتْ وَعَلَيْهَا مَا اكْتَسَبَتْ ۗ رَبَّنَا لَا تُؤَاخِذْنَا إِنْ نَسِينَا أَوْ أَخْطَأْنَا ۚ رَبَّنَا وَلَا تَحْمِلْ عَلَيْنَا إِصْرًا كَمَا حَمَلْتَهُ عَلَى الَّذِينَ مِنْ قَبْلِنَا ۚ رَبَّنَا وَلَا تُحَمِّلْنَا مَا لَا طَاقَةَ لَنَا بِهِ ۖ وَاعْفُ عَنَّا وَاغْفِرْ لَنَا وَارْحَمْنَا ۚ أَنْتَ مَوْلَانَا فَانْصُرْنَا عَلَى الْقَوْمِ الْكَافِرِينَ

(286)

It was narrated that Abu Mas’ood al-Badri (may Allaah be pleased with him) said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “The last two verses of Soorat al-Baqarah, whoever recites them at night, they will be sufficient for him.” Narrated by al-Bukhaari, 4008; Muslim, 807. Imaam al-Nawawi (may Allaah have mercy on him) said: “With regard to the words of the Prophet (peace and blessings of Allaah be upon him) ‘they will be sufficient for him,’ it was said that it means they will suffice instead of praying qiyaam al-layl; and it was said, they will suffice him against the Shaytaan, or against harm. It may be understood as meaning all of these things.’” 

Du’aa’ al-karb (prayer at times of stress). It was narrated from Ibn ‘Abbaas that the Messenger of Allaah (peace and blessings of Allaah be upon him) used to say at times of stress:

لا إِلَهَ إِلا اللَّهُ الْعَظِيمُ الْحَلِيمُ لا إِلَهَ إِلا اللَّهُ رَبُّ الْعَرْشِ الْعَظِيمِ لا إِلَهَ إِلا اللَّهُ رَبُّ السَّمَوَاتِ وَرَبُّ الأَرْضِ وَرَبُّ الْعَرْشِ الْكَرِيمِ

 (There is no god but Allaah, the Almighty, the Forbearing; there is no god but Allaah, Lord of the Mighty Throne; there is no god but Allaah, Lord of the heavens, Lord of the earth and Lord of the noble Throne).” Narrated by al-Bukhaari, 6346; Muslim, 2730. 

Reciting Soorat al-Ikhlaas, Soorat al-Falaq and Soorat al-Naas (the final three chaptes in the Qur'an; the last page in most copies). 
The Prophet (peace and blessings of Allaah be upon him) used to recite them when going to sleep, and he would blow into his hands and then wipe them over whatever he could reach of his body. It was narrated from ‘Aa’ishah that every night when the Prophet (peace and blessings of Allaah be upon him) went to bed, he would cup his hands together, blow into them then recite into them Qul Huwa Allaahu ahad, Qul a’oodhu bi Rabb il-falaq and Qul ‘aoodhu bi Rabb il-naas, then he would wipe as much as he could reach of his body, starting with his head and face and the front of his body. And he would do that three times. Narrated by al-Bukhaari, 5018. 

And it was narrated that ‘Uqbah ibn ‘Aamir said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Have you not seen the verses that were revealed tonight, the like of which has never been seen?Qul a’oodhu bi Rabb il-falaq and Qul ‘aoodhu bi Rabb il-naas. Narrated by Muslim, 814.