In the sentence you provided, the author introduces the key concept of "good sleep hygiene" as a set of behaviors that promote quality sleep. The phrase "will help ensure that middle schoolers get enough sleep" indicates the purpose and importance of practicing good sleep hygiene specifically for middle schoolers.
The author develops this key concept by:
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Defining the Concept: The term "good sleep hygiene" is a clear descriptor that sets the stage for understanding what types of behaviors are being discussed.
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Identifying the Target Audience: By specifically mentioning "middle schoolers," the author highlights the relevance of the concept to a particular age group, acknowledging that their sleep needs may differ from those of other demographics.
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Establishing a Cause-and-Effect Relationship: The phrase suggests a direct link between healthy sleep practices and the amount of sleep that middle schoolers receive, implying that by adopting good sleep hygiene, they can improve their sleep duration and quality.
This enhances the reader's understanding of why the concept is important and how it can positively impact a specific group of individuals.