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Saliva test reveals signs of sleep loss (Level A1) — aerial view of city during daytime

Saliva test reveals signs of sleep lossCEFR A1

17 Jun 2026

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Adapted from U. Zurich, Futurity • CC BY 4.0

Photo by Thimo Pedersen, Unsplash

Level A1 – Beginner
1 min
58 words
  • Many people have problems with sleep.
  • Sleep loss affects health and safety.
  • Researchers studied saliva to find signs.
  • Saliva can show changes after no sleep.
  • The study looked for small molecules.
  • They found markers that show tiredness.
  • The work was done by a university team.
  • They want a quick test at work.
  • A test could make roads safer.

Difficult words

  • sleep loss — few hours of rest or no rest at night
  • affect — change something or make it different
    affects
  • saliva — clear liquid made in the mouth
  • researcher — person who studies and tests things
    Researchers
  • molecule — very small part of a substance
    molecules
  • marker — a sign or thing that shows a condition
    markers

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Do you often feel tired?
  • Would you like a quick test at work?
  • Do you think a test could make roads safer?

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