But during the weekday, even though the “dew” came down also then, but it came down during the night, like it says (Bamidbar 11:9): “when the dew would come down on the ground during the night, then the Munn would descend onto it.” We see that the idea of the “dew” descending down to this world is connected to the idea of the “night”, since it represents how the name Havaya comes down to create this world that contains unholiness.
The idea of ‘night’ is expressed in the verse (Shir Hashirim 5:2): “The ‘locks of His hair’ are wet with raindrops in the night.” The word "ויָתֹּו צו וְּק" means “hairs”, like we see in the one of the following verses (verse 11) that: “His ‘head’ is pure gold, ויָתֹּו צֻוְק םיִּלַּתְלַּת-His locks hang down, they are black like a raven,” we see that ויָּתֹּו צֻוְּק must mean hair, since it is described as hanging down and black. This is referring the aspect of Hashem’s revelation called “Havaya” which “ריִעֵ שִמ ךְתאֵצְּב-You go out to us through a hairsbreadth revelation” to create everything, this level of “hairs” is connected to “night” and “blackness”, since it comes into the limitations of creating a world where unholiness can exist.