11:02 15/05/2026
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Nguồn tham khảo
  1. Fatigue and exhaustion: causes, symptoms, and treatment. (2025, November 12). Retrieved from https://www.webmd.com/balance/how-tired-is-too-tired
  2. Wolters, C., Hood, R., & Yu, M. (2026, April 10). Waking up tired after 8 hours? Causes, cycles & how to improve sleep quality. US News & World Report. Retrieved from https://health.usnews.com
  3. Rd, J. K. M. (2026, January 22). Why am I so tired? 12 reasons (Plus solutions). Retrieved from https://www.healthline.com/nutrition/10-reasons-you-are-tired
  4. Clinic, C. (2026, January 30). 6 reasons why you wake up tired, even after a long night’s sleep. Retrieved from https://health.clevelandclinic.org/why-you-wake-up-tired-after-8-hours-of-sleep
  5. What are sleep deprivation and deficiency? | NHLBI, NIH. (2022, March 24). Retrieved from https://www.nhlbi.nih.gov/health/sleep-deprivation
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