Abu Ja`far Muhammad b. `Ali b. al-Husayn b. Musa b. Babuwayh al-Qummi (rh) narrated to us. He said: Muhammad b. al-Hasan b. Ahmad b. al-Walid (ra) narrated to us. He said: Muhammad b. al-Hasan al-Saffar narrated to us. He said: Al-`Abbas b. Ma`ruf narrated to us from Sa`dan b. Muslim from Abi `Abdillah al-Sadiq (as). He said
Sleep is the relaxation of the body, speech is the relaxation of the soul, and silence is the relaxation of the intellect.