Which of the following factors link circadian control of sleep and wake cycles with the environment? (Select all that apply.)

A) Sound
B) Light
C) Physical activity
D) Melatonin
E) Caffeine

Circadian Control

The regulation of biological rhythms and processes in accordance with the 24-hour cycle of day and night.

Melatonin

A hormone produced by the pineal gland that regulates sleep-wake cycles, often used as a dietary supplement to aid sleep.

Physical Activity

Any movement of the body that requires energy expenditure, including everyday activities, exercise, and sports.