Answer:
The time between daylight and darkness when blood drinkers like to come out
Lovely and round, I shine with pale light, Grown in the darkness, a ladyβs delight.
Many people own a copy of me. Without me the world would fall.
The more you look at me The less you see.
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I am always hungry, I must always be fed. The finger I lick will soon turn red. What am I?