Humans continuously exposed to bright light are most likely to experience a disruption of their

A) narcolepsy.
B) sleep apnea.
C) alpha waves.
D) circadian rhythm.

The circadian rhythm is the internal 24-hour clock that regulates sleep-wake cycles and other physiological processes. Bright light exposure can disrupt this rhythm, causing difficulty falling and staying asleep, as well as other health problems such as mood disorders and impaired cognitive functioning.