09:17 12/08/2026
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Nguồn tham khảo
  1. Silver, N. (2024, January 30). Why do I keep waking up at 3 a.m.? Healthline. https://www.healthline.com/health/sleep/why-do-i-keep-waking-up-at-3-am#sleep-cycles
  2. Fiorentino, L., & Martin, J. L. (2010). Awake at 4 AM: treatment of insomnia with early morning awakenings among older adults. Journal of clinical psychology66(11), 1161–1174. https://doi.org/10.1002/jclp.20734
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