Home › Words › H › halfsleephalfsleephalfsleep means in halfsleep.EtymologyFrom half- + sleep.adjIn halfsleep.nounState between being awake and being asleep; light sleep.e.g.“Nick found Judah still out on the floor next to the open and emptied safe. Winded and slobbering in a halfsleep.” — 2021, Michael Farris Smith, chapter 55, in Nick, New York; Boston; London: Little, Brown and Company, page 269:Definitions & examples from Wiktionary (CC BY-SA 3.0).