Sleepless
来自Big Physics
wiktionary
From Middle English slepeles, from Old English slǣplēas; equivalent to sleep + -less.
etymonline
sleepless (adj.)
early 15c., from sleep (n.) + -less. Old English had slæpleas but the modern word seems to be a re-formation. Similar formation in German schlaflos, Dutch slapeloos. Related: Sleeplessly; sleeplessness.
