I think this poem meaning is : when the day started , the night finished completely
My friend please look at my understanding from this poem: day is full of energy and light which Sun cause this case for the day; light day full of energy , warm day full of sunrise
The night doesn't have any eye but in this poem ,potry assumed Night have eyes,100 eyes .actually ( Nizami) poetry would say to us Night is as day is full of darkness and its specific energy
You know
Day
And Night
In this poem are signs of two case of day and night which are maturity