ONEIROI by Peachtree

THE ONEIROI were the dark-winged spirits (daimones) of dreams which emerged each night like a flock of bats from their cavernous home in Erebos--the land of eternal darkness beyond the rising sun. The Oneiroi passed through one of two gates (pylai). ... The term for nightmare was melas oneiros (black dream).

https://www.theoi.com/Daimon/Oneiroi.html#:~:text=THE%20ONEIROI%20were%20the%20dark,of%20two%20gates%20(pylai).&text=The%20term%20for%20nightmare%20was%20melas%20oneiros%20(black%20dream).

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