What are two factors that help regulate our natural sleep/wake cycles?

Question

Quizplus · Accepted Answer

Melatonin and light are the two primary factors that help regulate our natural sleep/wake cycles. Melatonin is a hormone that is released by the pineal gland in response to darkness and helps us feel sleepy, while exposure to light (particularly natural daylight) can help regulate our circadian rhythm and make us feel more awake during the day. Other factors such as psychological factors and serotonin can also affect our sleep, but they are not as directly involved in regulating our natural sleep/wake cycles as melatonin and light.

What Are Two Factors That Help Regulate Our Natural Sleep/wake