When going to sleep it is recommended to recite Ayat al-Kursi, Surat al-Ikhlas, Surat al-Falaq, Surat al-Nas, and the last two verse of al-Baqara. This is something to give particular attention to and is emphasized to heed, since rigorously authenticated Ahadith concerning this have been established.
Abu Masud al-Badri, may Allah be pleased with him, relates that the Messenger of Allah (peace be upon him) said, “The two verses at the end of al-Baqara are sufficient [in blessings and protection] for anyone who reads them in one night.” [Bukhari]
Ali ibn Abi Talib, may Allah be pleased with him, said, “I have not seen any rational person who has entered Islam sleep until he had recited Ayat al-Kursi (Quran, 2:255). [Darimi]
Uqba ibn Amir, may Allah be pleased with him, said, “The Messenger of Allah (peace be upon him) said to me, ‘Do not let a night pass you unless you recite therein al-Ikhlas, al-Falaq, and al-Nas.’ Thereafter, not a night passed me unless I recited them.” [Ahmad]
Compiled From: “Etiquette with the Quran” – Imam al-Nawawi