Which term describes going to bed early and waking up early?

Which term describes going to bed early and waking up early?

• A. Delated sleep phase syndrome
• B. Non-24hour sleep wake disorder
• C. Advanced sleep phase syndrome
• D. Shift work sleep disorder

Answer: (C)

An advanced sleep phase describes a circadian timing pattern where the internal clock is shifted earlier than the social clock. People with this pattern typically feel sleepy in the early evening and wake up much earlier in the morning—often around 3 to 5 a.m.—making late-night activities and standard wake times difficult. This differs from going to bed late and waking late (delayed phase), from a 24-hour rhythm that isn’t aligned to the 24-hour day (Non-24-hour sleep-wake disorder), or from sleep problems caused by work schedules (shift work sleep disorder), which aren’t about an intrinsic early shift in the sleep cycle. If you picture the clock as running ahead of societal hours, that’s the advanced phase in action.

An advanced sleep phase describes a circadian timing pattern where the internal clock is shifted earlier than the social clock. People with this pattern typically feel sleepy in the early evening and wake up much earlier in the morning—often around 3 to 5 a.m.—making late-night activities and standard wake times difficult. This differs from going to bed late and waking late (delayed phase), from a 24-hour rhythm that isn’t aligned to the 24-hour day (Non-24-hour sleep-wake disorder), or from sleep problems caused by work schedules (shift work sleep disorder), which aren’t about an intrinsic early shift in the sleep cycle. If you picture the clock as running ahead of societal hours, that’s the advanced phase in action.