Which of the following is a sign of an overdose?

Extreme sleepiness and shallow breathing are hallmark signs of an overdose, particularly with depressants such as opioids or sedatives. During an overdose, the body's normal processes can become severely impaired; for instance, shallow breathing indicates that the body is not receiving enough oxygen, which is a critical concern. This state can progress rapidly and lead to unconsciousness, coma, or death if emergency intervention is not provided. Recognizing these signs is essential for immediate action and potentially life-saving measures. In contrast, increased energy and clarity, rapid heartbeat, high blood pressure, and persistent nausea and vomiting may suggest other conditions or reactions not specific to an overdose scenario, making them less indicative of this serious health crisis.