By the way Endy, here is a post of mine you may not have seen
Endymion predates Dan Simmons by millennia, Endy!
In Greek mythology, he was the most handsome of men, the god of eternal youth and fertility. Some versions describe him as king, others as a shepherd. The moon goddess Selene was so smitten with Endymion's beauty that she put him into a perpetual sleep so that she could kiss him whenever she wished.
In his poem ENDYMION, John Keats starts with the famous sentence:
A thing of beauty is a joy for ever:
Its loveliness increases; it will never
Pass into nothingness; but still will keep
A bower quiet for us, and a sleep
Full of sweet dreams, and health, and quiet breathing