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Sleep rhythms, brain cleaning and dementia risk (Level A1) — A computer generated image of a brain surrounded by wires

Sleep rhythms, brain cleaning and dementia riskCEFR A1

26 May 2026

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Adapted from U. Rochester-URMC, Futurity • CC BY 4.0

Photo by Bhautik Patel, Unsplash

Level A1 – Beginner
1 min
48 words
  • Sleep helps the brain clean itself.
  • This cleaning happens at night.
  • Sleep is an organized body state.
  • Slow rhythms appear during deep sleep.
  • These rhythms move fluid through the brain.
  • Aging and stress can change rhythms.
  • When rhythms change, waste can stay.
  • Poor sleep may harm brain health.

Difficult words

  • clean — remove dirt or unwanted things
  • organized — planned and with parts in order
  • rhythm — regular pattern of movement or sound
    rhythms
  • aging — process of getting older over time
  • stress — strong worry or pressure on someone
  • waste — unwanted material or things left over

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

Discussion questions

  • Do you sleep at night?
  • Do you feel stressed sometimes?
  • Do you think sleep is good for the brain?

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