This is easy, right? No, I'm not darkness. Blink, Blink, Blink.... Can you see me? No? Blink again, and tell me what you see. Nothing? Wow, you think it's that easy? No, it's surely not. And if you try being funny... I don't mean the inside of your eyelids neither. Blink and think... blink and think... Tick tack, think faster, my time is not endless....
Hint
Think about the last sentence