The Prophet (PBUH) also said: ‘When you are about to sleep recite aayat-ul-kursiyy till the end of the verse for there will remain over you a protection from Allah and no devil will draw near to you until morning.’
‘None has the right to be worshipped but He, the Ever Living, the One Who sustains and protects all that exists. Neither slumber, nor sleep overtake Him. To Him belongs whatever is in the heavens and whatever is on earth. Who is he that can intercede with Him except with His Permission? He knows what happens to them (His creatures) in this world, and what will happen to them in the Hereafter . And they will never compass anything of His Knowledge except that which He wills. His Kursî extends over the heavens and the earth, and He feels no fatigue in guarding and preserving them. And He is the Most High, the Most Great‘.