Even after sleeping for eight hours a day do you feel sleep deprived and yawn the whole day? A new study has found the answer to your question. The study suggests that the duration and timing of sleep vary in individuals depending on their age gender and region where they live. It was interesting to find that the circadian rhythm shifts later even in people over 20 years of age. It was already previously known that sleep timing is delayed in adolescence. What was clearly highlighted in this study is how long into adulthood this actually carries on said Liisa Kuula
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