We are no longer entirely in the realm of Greek mythology.
"Oh, please," he said. "Your domain is sleep. What are you going to do, make me drowsy?"
She stared at him a moment. To someone who had only met her, she would have appeared unmoved. "You are not wary of sleep as you fear other facets of your life. You should be." She cocked her head to one side, looking nostalgic. "You would be, if I cared to explain why." Her smile turned chilly as her focus came back to the present. "But you are in no mood to listen, and I am in a good enough mood not to explain. So I will say this, instead:"
In the flicker of an eyelash, she closed the distance between them.
She said lowly, "My mother is life. When she could not find me, the Earth froze and burned in the wake of her misery. If she thought she could remove an obstacle to my happiness, that power would become rather focused." The last word was a hiss, and the man's eyes widened as his skin turned ashen.
"But, oh, we must remember who took me from her, must we not? The one she could not simply focus on. You insolent beast, my consort is death. And do believe me when I say cessation of existence is a mercy compared to what he would do for me, if I asked it."
She smiled in the way that someone of immaculate breeding will when they are beyond anger, beyond fury, and well into planning. "You do not fear my powers? Very well. I will allow you that luxury. But do remember the powers of those who care for me, or you shall quickly find yourself unable to forget."