Sleep never prevails over them...
Sleep never prevails over them, their intellects are never overcome by inadvertence and forgetfulness, their bodies never experience lethargy, and they are never ensconced in the loins of fathers and the wombs of mothers.[^18] They possess different grades and varied ranks; some are always in a state of ruku' while others are perpetually in a state of prostration.
59, pp. 144-326) and Nahjul Balaghah, Sermons 1, 91, 109 and 171.) Question In view of the characteristics that have been mentioned above, are angels corporeal or non-corporeal entities? Undoubtedly, with the characteristics that they possess, they cannot be constituted of this lowly and elemental matter; nevertheless it is possible for them to have been created out of subtle material elements - material elements that are superior to this ordinary matter familiar to us.
Proving absolute immateriality for the angels - immateriality with respect to place, time and parts - is not an easy task and furthermore, research on this subject does not possess that great a benefit.
The important thing is that we recognize the angels according to the attributes that have been mentioned by the Qur’an and the conclusive Islamic traditions, and regard them as a huge assemblage of lofty and preeminent entities of Allah (s.w.t.) without attributing any status to them except that of servitude and slavery (of Allah (s.w.t.) ) and without regarding them as being partners to Allah (s.w.t.) in creation and worship, for then this would be downright polytheism and kufr.
In connection with the angels we content ourselves with what has been discussed and leave the details for books, specifically devoted to this topic.