Which of the following is an external marker that helps us set up 24-hour sleep rhythms?
A) hunger
B) physical activity
C) light and darkness
D) lunar patterns

Question

Quizplus · Accepted Answer

Light and darkness are external markers that help set up 24-hour sleep rhythms, known as circadian rhythms. Our bodies are wired to respond to light and darkness cues to regulate our sleep-wake cycle. This is why it's often recommended to avoid exposure to bright light (especially blue light from electronic screens) before bedtime and to seek out bright light in the morning to help establish a healthy sleep schedule.

Which of the Following Is an External Marker That Helps