Sleep researchers have established that people vary in their morningness and eveningness. These preferences change with age due to ____.

Question

Quizplus · Accepted Answer

Morningness and eveningness preferences change with age due to changes in growth hormone levels. As we age, there is a decline in the secretion of growth hormone, which is linked to a shift toward morningness. Younger individuals tend to be more evening-oriented and prefer to stay awake late at night, while older individuals tend to feel more alert in the morning and have earlier bedtimes. Testosterone and estrogen levels can also affect sleep patterns, but they are not the main driver of morningness and eveningness preferences. Similarly, neurotransmitter levels play a role in sleep regulation, but their impact on circadian rhythms is not as strong as hormones such as growth hormone.

Sleep Researchers Have Established That People Vary in Their Morningness