Allah — there is no deity except Him, the Ever-Living, the Sustainer of existence. Neither drowsiness overtakes Him nor sleep. To Him belongs whatever is in the heavens and whatever is on the earth.
Benefits of Ayatul Kursi
Greatest verse in the Quran (Sahih Muslim 810)
Protection from Shaytan when recited before sleeping (Sahih al-Bukhari 5010)
Entry into Paradise after every Fard prayer (Al-Nasai)