Jennifer is 16 years old and tends to stay up late at night, going to sleep around 2:00 a.m. On the weekends she tends to sleep very late in the day, often not waking until after noon. This shift in the sleep-wake pattern that occurs during adolescence is called:

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During adolescence, there is a natural shift in the circadian rhythm, leading to a delayed sleep phase where teenagers tend to go to bed later and wake up later, known as delayed circadian phase.

Jennifer Is 16 Years Old and Tends to Stay Up