I understand nothing of ancient Greek, but according to the article in the image you quoted, the reference for such a statement is the book The Gods of the Greeks. I have looked for the book online, but unfortunately the places where access to it is possible are paid. However, I found a website that quotes the passage from the book, which reads "Eione, 'the snore-goddess'". It may be a typo (the "h" next to the "n" on keyboard), but if we saw the book, we would know for sure. The author, Károly Kerényi, is an authority on the subject of Greek mythology, so I don't think he would be wrong…
Well, let's hope someone here knows about it!
Gods of the Greeks by Karl Kerenyi is one of my favourites. It has a companion Heroes of the Greeks as well. One of the many reasons I really like these books is that many different, sometimes very obscure, versions of stories are looked at.
My favorite is Karl Kerenyi: The Gods of the Greeks and The Heroes of the Greeks.