Why you feel tired after 8 hours sleep

A recent study suggests that sleep quality depends not only on the number of hours a person sleeps but also on environmental factors such as room temperature, lighting, and noise. The study involved 372 young people over a period of 14 days. It found that extreme heat reduces sleep quality and efficiency by 45%, even though total sleep hours did not decrease. Additionally, bothersome lighting and household noise are associated with lower sleep quality, while the duration of sleep remains largely unaffected. The results confirm that simply counting hours is not enough to assess the quality of sleep; sleep can be more stable and comfortable for someone who experiences the same duration but in a more suitable environment.

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