Question: There are young men here who swear by the words: “Exalted is He whose Eyes do not sleep”. Is this a permissible oath? These young men link the Attribute of not being liable to sleep with the Eye of the Creator (Glorified and Exalted be He). Allaah did not tell us that. All that is mentioned in the Qur’aan is His saying: Neither slumber nor sleep overtakes Him.
Answer: Saying: “Exalted is He Whose Eyes do not sleep” or “By Allaah Whose Eyes do not sleep” is permissible. It is an Attribute of perfection. Allaah says in the Qur’an: …in order that you may be brought up under My Eye. According to the Qur’aan, Allaah is neither overtaken by drowsiness nor sleep… read more here.