*Hesiod, fr. 312 MW (Fragmenta Hesiodea, eds. R. Merkelbach and M. L. West [1967], p. 162):
Hesiod says that of all birds, only the nightingale has little regard for sleep but lies awake forever. The swallow does not always lie awake and loses but half of its sleep. They pay this penalty because of the insolent incident that occurred at that unlawful banquet in Thrace (translated by Aaron J. Ivey).
Gantz, Early Greek Myth (1993) 