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After you drink, “your sleep quality is not as good, even though the number of hours you’re spending unconscious may be the same,” said Dr. Carl Erik Fisher, an addiction psychiatrist at Columbia.

Suspected suicides . . . can be misclassified as accidents or drug overdoses, making it difficult to ascribe meaning to smaller changes in the numbers, said Dr. Mark Olfson.

Paul Appelbaum, MD, said it may be preferable for police to remain in the background and send in a mental health professional to engage with a suicidal person.

"Humans evolved with the neurocircuitry to see another person as special," writes Amir Levine, MD, an associate professor of clinical psychiatry at Columbia.