from The Century Dictionary.

  • To sleep less than is necessary.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb intransitive To sleep too little.


from Wiktionary, Creative Commons Attribution/Share-Alike License

under- +‎ sleep


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  • There are plenty of people who overwork without economic necessity, undersleep, undereat, don't let themselves relax, damage their joints with punitive exercise, etc.

    Maslow, Chakras, and what drives us Steven Barnes 2009

  • Better to undersleep than oversleep, they figured.

    ASK TIP SHEET 2007

  • Without protest, and without notice until too late, teachers often neglect their own health at home and at school, -- recklessly overwork, undersleep, and undernourish; ruin their eyes, their digestion, and their nerves.

    Civics and Health William H. Allen

  • Youth needs overexertion to compensate for underexertion, to undersleep in order to offset oversleep at times.

    Youth: Its Education, Regimen, and Hygiene G. Stanley Hall 1885


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