Some metaphors depend on the relationship or sequence of elements rather than one isolated quality. The departure of daylight may be represented through the image of removing a covering.
«وَآيَةٌ لَهُمُ اللَّيْلُ نَسْلَخُ مِنْهُ النَّهَارَ»
A sign for them is the night; We strip the day from it.
The verb evokes the act of stripping. Its application to the separation of day and night evokes a pattern of removal, not only the qualities of light and darkness.