The term /azwaj/ is the plural form of the term /zauj/ which means 'mate...

The term /azwaj/ is the plural form of the term /zauj/ which means 'mate, companion, a couple, and gender (husband or wife) ' from which not only is a man created and through which his generation survives, but also his spouse is counted as the reason for his spiritual tranquillity, as Sura Rum, No. 30.

verse, 21 says: And among His Signs is this, that He created for you males from among yourselves, that you may dwell in tranquillity with them, and He has put love and mercy between your (hearts) In other words, the genders (masculine and feminine) are the complement of each other then, they become complete and this makes them a whole.

Since the term /azwaj/ also means: 'kinds, species, and classes', some commentators have rendered it to mean: 'the variations in Man from the point of color, race, language, different spiritual levels and talents'; which are signs of Allah's greatness and the cause of perfection in societies. Then, it refers to 'sleep' a grand divine gift to Man, and says: And We made your sleep for repose,.

The term /subat/is derived from /sabt/which originally means 'discontinue, rest' and then it was used for the 'suspension of work' for the purpose of resting, and that the term 'Saturday' in the Arabic vocabulary is called /yaum-us-sabt/ because it had been affected by the custom of the Jews who stopped working on Saturday. Thus, the term /subat/ narrowly refers to the stopping of most of Man's physical and mental activities when he sleeps.

The very temporary stopping of activity causes refreshment and improvement for the tired organs, strengthening the soul and the body, renewing one's pleasure, removing any fatigue and uneasiness, and consequently, making Man ready to start working again. Though one-third of the human beings' lifetime is occupied by sleep and they have always been entangled with the question of 'dreams', still they wonder about the mysteries of sleep.

Even yet, it is not exactly known why that at a special moment the mind fails to work well, the eyelids droop and all the limbs come to a peaceful state. But, one thing is definitely known and that is: sleep is of great importance to one's health, and that is why psychiatrists try to make their patients' sleep normally and regularly, because it is impossible to cure them without it. Those who do not sleep enough are pale, withered, nervous, and dull.

On the contrary, those who sleep normally, when they rise they feel, in themselves, much pleasure and vitality.