Remember when He caused drowsiness to overcome you, as a reassurance from Him…He [Sahl] said:Drowsiness (nuʿās) descends from the brain while yet the heart remains awake [lit. alive]. Sleep (nawm) [only descends] on the heart outwardly. That is the rule (ḥukm) [for] sleep. However, the same rule [that applied to the heart] regarding drowsiness [applies to] the spirit (rūḥ). His words: