10:43 15/09/2025
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Nguồn tham khảo
  1. Professional, C. C. M. (2025, April 25). Sleep. Retrieved from https://my.clevelandclinic.org/health/body/12148-sleep-basics
  2. Brain basics: Understanding sleep. (n.d.). Retrieved from https://www.ninds.nih.gov/health-information/public-education/brain-basics/brain-basics-understanding-sleep
  3. sleepsurvey. (n.d.). Retrieved from https://sleepsurvey.resmed.com/
  4. Science of Sleep: What is Sleep? (n.d.). Retrieved from https://sleep.hms.harvard.edu/education-training/public-education/sleep-and-health-education-program/sleep-health-education-47
  5. Bryan, L., & Bryan, L. (2025, July 10). Why do we need sleep? Retrieved from https://www.sleepfoundation.org/how-sleep-works/why-do-we-need-sleep
  6. Noyed, D., & Noyed, D. (2025, July 22). How is sleep quality calculated? Retrieved from https://www.sleepfoundation.org/sleep-hygiene/how-is-sleep-quality-calculated
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