Which circadian factor contributes to adolescents’ reduced sleep duration?

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Multiple Choice

Which circadian factor contributes to adolescents’ reduced sleep duration?

Adolescents naturally exhibit a delay in their circadian phase, tending toward eveningness. This means their internal clock signals them to sleep later and wake later. When school starts early, they’re forced to wake up well before their biological clock would prefer, cutting into total sleep time. That mismatch between a later sleep schedule and an early wake time is what reduces sleep duration. External constraints like early school start times aren’t themselves circadian shifts, though they contribute to less sleep by forcing early wake times. Increased daylight exposure can influence the clock but usually helps with wakefulness and does not by itself shorten nighttime sleep. Increased napping adds daytime sleep rather than reducing nighttime sleep.

Adolescents naturally exhibit a delay in their circadian phase, tending toward eveningness. This means their internal clock signals them to sleep later and wake later. When school starts early, they’re forced to wake up well before their biological clock would prefer, cutting into total sleep time. That mismatch between a later sleep schedule and an early wake time is what reduces sleep duration.

External constraints like early school start times aren’t themselves circadian shifts, though they contribute to less sleep by forcing early wake times. Increased daylight exposure can influence the clock but usually helps with wakefulness and does not by itself shorten nighttime sleep. Increased napping adds daytime sleep rather than reducing nighttime sleep.

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