- 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 soundrhythms
- 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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