"darkness of night" is correct and usable in written English.
You can use it when referring to the time of night when it is dark. Example: "The darkness of night made it difficult to see the stars in the sky."
Because of the risk of electric shocks, the operation had to be undertaken during the 31 minutes when then station slipped into the darkness of night when the dark shadow of Earth cuts off power to the solar arrays.
I am a woman under burqa/I can't breathe/I can't catch my breath/Its color looks blue, but actually it is dark/ It is darker than the darkness of night./ If I take it off people will throw stones on me.
The darkness of night misted over the eyes of Andromache".
The cold has a sharper edge; the darkness of night seems more penetrating and brittle.
He and his siblings made the dangerous journey in the darkness of night following the deaths of his parents.
By bus and by foot, in the darkness of night, she made her way to New York.
This cosmology connects conscious thought and the darkness of night as a reversal moment whose transformative energies are still with the people.
After all, it is indifferent to those who are leaving for ever whether they die in the sun, in shadow, or the darkness of night.
The artful spillover that turns "bumping" from intransitive to transitive helps to convey the headlong plunge of the riders in the darkness of night.
Like the work of Mr. Hughes and Mr. DeCarava, Mr. Bey's images refuse to represent the darkness of night as a space of intimidation.
Malcolm also tells a Bible story in darkness of night, and the theater lights go out -- except for a big red Exit sign that destroys the illusion.
