Which statement is true about circadian rhythm sleep-wake disorders?

Which statement is true about circadian rhythm sleep-wake disorders?

• A. They involve misalignment between internal clock and environmental cues; examples include jet lag and shift-work sleep disorder
• B. They always require overnight testing
• C. They are unrelated to daytime sleepiness
• D. They occur only in older adults

Answer: (A)

Circadian rhythm sleep-wake disorders come from a mismatch between the body’s internal 24-hour clock and the outside world’s cues, like light and daily schedules. When this timing is out of sync, sleep happens at the wrong times and daytime functioning suffers. Jet lag and shift-work sleep disorder are classic examples because they directly disrupt the normal alignment between internal rhythms and the environment. Diagnosis does not require overnight testing; clinicians often use sleep logs, actigraphy, or diary data to gauge timing and sleep patterns, reserving overnight testing for ruling out other sleep disorders if needed. Daytime sleepiness or impaired alertness is a common feature, reflecting the misalignment rather than a purely primary sleep problem. And these disorders can occur at various ages, not just in older adults. So the statement that best fits is that circadian rhythm sleep-wake disorders involve misalignment between the internal clock and environmental cues, with jet lag and shift-work sleep disorder as examples.

Circadian rhythm sleep-wake disorders come from a mismatch between the body’s internal 24-hour clock and the outside world’s cues, like light and daily schedules. When this timing is out of sync, sleep happens at the wrong times and daytime functioning suffers. Jet lag and shift-work sleep disorder are classic examples because they directly disrupt the normal alignment between internal rhythms and the environment.

Diagnosis does not require overnight testing; clinicians often use sleep logs, actigraphy, or diary data to gauge timing and sleep patterns, reserving overnight testing for ruling out other sleep disorders if needed.

Daytime sleepiness or impaired alertness is a common feature, reflecting the misalignment rather than a purely primary sleep problem. And these disorders can occur at various ages, not just in older adults.

So the statement that best fits is that circadian rhythm sleep-wake disorders involve misalignment between the internal clock and environmental cues, with jet lag and shift-work sleep disorder as examples.