Mr. grammarcy has been having trouble sleeping at night, and his lack of sleep is beginning to interfere with his ability to function properly during the day. he’s concerned that he may lose his job in the next round of lay-offs at his company. he is also having marital problems. he tends to lay awake at night, worrying about these problems and thinking about what he can do to resolve these issues. based on the discussion in the text, mr. grammarcy should understand that

A. worrying increases one's bodily arousal, which can prevent normal sleep.

Explanation:

The arousal refers to the state of physical and/or mental activation that we experience when we are on alert. The arousal can be cognitive, emotional or physical.

Emotional arousal occurs when there is a very high emotional load that keeps the person on alert due to an excess of adrenaline production in the body.

In this case, Mr. Grammarcy is experiencing emotional activation due to his marital problems. This activation is responsible for preventing sleep at night, the most advisable to help him to sleep is to find a solution to the problems he has with his wife.

I hope this information can help you.