What is a general indicator of someone who is "on the nod"?

The term "on the nod" refers to a state where an individual appears drowsy or lethargic, which is often associated with the use of certain opioids or sedative substances. A general indicator of someone in this state is facial itching. This symptom is commonly observed in individuals using opioids, as these substances can cause various physiological effects, including pruritus (itching). The sensation of itching is often linked to the release of histamines in the body caused by the drug's effects. Therefore, when someone is seen exhibiting signs of fatigue, drowsiness, and facial itching, it can be a strong indicator of opioid use and that they are "on the nod." This knowledge is important in the context of law enforcement and emergency response, as recognizing these signs can aid in proper assessment and intervention.