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


  • 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

  • Better to undersleep than oversleep, they figured.


  • 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

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

    Youth: Its Education, Regimen, and Hygiene


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