They were very happy together in Trachis, and according to Pseudo-Apollodorus's account, often sacrilegiously called each other "Zeus" and "Hera". This angered Zeus, so while Ceyx was at sea (going to consult an oracle according to Ovid's account), the god threw a thunderbolt at his ship. Soon after, Morpheus (God of Dreams) disguised as Ceyx appeared to Alcyone as an apparition to tell her of his fate, and she threw herself into the sea in her grief. Out of compassion, the gods changed them both into halcyon birds, named after her.
Ovid and Hyginus both also recount the metamorphosis of the pair in and after Ceyx's loss in a terrible storm, though they both omit Ceyx and Alcyone calling each other Zeus and Hera (and Zeus's resulting anger) as a reason for it. Ovid also adds the detail of her seeing his body washed up onshore before her attempted suicide.
Ovid and Hyginus both also make the metamorphosis the origin of the etymology for "halcyon days," the seven days in winter when storms never occur. They state that these were originally the 14 days each year (seven days on either side of the shortest day of the year) during which Alcyone (as a kingfisher) laid her eggs and made her nest on the beach and during which her father Aeolus, god of the winds, restrained the winds and calmed the waves so she could do so in safety. The phrase has since become to refer to any peaceful time. Its proper meaning, however, is that of a lucky break, or a bright interval set in the midst of adversity; just as the days of calm and mild weather are set in the height of winter for the sake of the kingfishers' egglaying.
- Various kinds of kingfishers are named after the couple, in reference to the metamorphosis myth:
- Their story features in The Book of the Duchess.
- Their story is the basis for the opera Alcyone by the French composer Marin Marais
- A collection of Canada's celebrated nature poet, Archibald Lampman, Alcyone, his final set of poetry published posthumously in 1899, highlights both Lampman's apocalyptic and utopian visions of the future.
- TS Eliot draws from this myth in The Dry Salvages: "And the ragged rock in the restless waters,/Waves wash over it, fogs conceal it;/On a halcyon day it is merely a monument,/In navigable weather it is always a seamark/To lay a course by: but in the sombre season/Or the sudden fury, is what it always was."
Classical sources 
- Hesiod, Catalogue of Women fr. 15; Apollodorus i. 7. 3 - 4)
- Ovid Metamorphoses XI, 410ff.-748 (also here)
- Hyginus Fabulae 65
- William Smith, ed. (1867). [[Dictionary of Greek and Roman Biography and Mythology]] - volume 1. p. 108. "It was fabled, that during the seven days before, and as many after, the shortest day of the year, while the bird ἀλκυών, was breeding, there always prevailed calms at sea." Wikilink embedded in URL title (help)
- Virgil Georgics i. 399 - "[At that time] not to the sun's warmth then upon the shore / Do halcyons dear to Thetis ope their wings"
Other sources 
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This article incorporates text from a publication now in the public domain: Smith, William, ed. (1867). "article name needed". Dictionary of Greek and Roman Biography and Mythology.