Her mother was Selene, goddess of the moon and her father was Apollo, god of the sun.
Selene, her mother, asked Zeus to give Endymion eternal youth and immortality on the condition he was to be asleep forever.
She would visit him at night, but life got lonely, for his sleeping state could not interact with her.
One morning, Apollo saw that Eos (the goddess of dawn) had not yet come for him, for after her was he supposed to trail to give Greece light.
He went to look for her and when he found Eos he asked, "Why didn't you awaken me? Do you not see it should be morn already?"
Eos replied, "My sister is grieving, for her love is quiet as the dead, but as alive as Poseidon's sea. She is lonely, but cannot leave his side. She has 50 daughters with him, but they are all grown."
So he went to the cave on the peak of Mount Latmos and found her, weeping next to her slumbering love.
"Selene," he asked, "why are you not going? Eos is waiting for you."
But then he saw the deep sadness in her eyes, so he comforted her for three days, three nights, and three hours.
On the last night, Selene told him that she had fallen in love with him and was with his child.
Apollo responded "How dare you love me, when there is darkness in Greece because of your obsession with this mortal?" while he pointed at the sleeping Endymion.
Filled with humiliation and rage, she drove away in her silver chariot, Eos barely able to keep up behind her, and Apollo after Eos.
The next night Selene acted like nothing was wrong, but her child was swimming in a sea of her mother's resentment and rage, the pain of being rejected by Apollo seeping into the unborn child.
On the day the child was born, Apollo had a terrifying dream.
It was a dream of his death, along with everyone he loved.
The babe was a girl, with head full of black curls, the color of midnight, and bright piercing golden eyes, the color of the sun, and the power of producing dreams.
But her mother's anger and pain had become part of the girl's very soul.
Selene named her Efialtis, meaning nightmare. For during the day, Efialtis would sleep peacefully, with dreams of happiness and sunlight, and those dreams would spill onto the children, distracting them from their schooling-daydreams.
But at night when she woke, when her mother reined the skies, Efialtis' pain would overflow, and cause bloodcurdling dreams to all those who were asleep, so that they would feel her agony.
The End
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