'Night' in the Bible

On my couch by night, I sought him whom my soul hath loved; I sought him, and I found him not!

All of them holding sword, taught of battle, Each his sword by his thigh, for fear at night.

I am sleeping, but my heart waketh: The sound of my beloved knocking! 'Open to me, my sister, my friend, My dove, my perfect one, For my head is filled with dew, My locks with drops of the night.'