Final answer:
Many adolescents struggle to get enough sleep because the high school schedule is incongruent with their natural body rhythms.
Step-by-step explanation:
Many adolescents struggle to get enough sleep because the high school schedule is incongruent with their natural body rhythms. Our circadian rhythms, which regulate sleep-wake cycles, are influenced by external cues like light and darkness. When teenagers are required to wake up early for school, it can disrupt their natural sleep patterns and make it difficult for them to fall asleep at night. This can result in a lack of sufficient sleep, which can have negative impacts on their physical and mental health.