I was browsing through a book of Greek mythology... when I came across a
myth that influenced Sailor Moon. Here what I found:

***

        Selene (Could be Serena), the moon, came out at night to light up
the world while her brother, Helios, was resting. Slowly she drove her
milk-white horses scross the sky, and her pale moonbeams fell gently on the
sleeping earth where all was peace and quiet.
        One night Selene/Serena's soft light fell on Endymion ( name sound
familar ? ), a young shepard, who was sleeping beside his flock. She
stopped to look at him. He was smiling in his sleep and was so young and
handsome that she completely lost her heart to him. She drove through the
night, but she could not get him out of her mind.
        When her duties were over, she went to Zeus and asked him to grant
Endymion eternal sleep so he would stay forever young and handsome. She had
learned from her sister, Eos, not to ask for eternal life for a mortal and
be left with a grasshopper on her hands.
        Zeus granted Selene/Serena's wish and Endymion slept on and on,
smiling in his sleep. He dreamed that he held the moon in his arms. But it
was not a dream after all, for Selene/Serena bore her husband fifty
daughters ( !!!!!!!! ), all pale and beutiful as their mother and sleepy
like their father.