Taking too many sleeping pills at once or taking sleeping pills and alcohol simultaneously can cause a deadly overdose. Many sleeping pill overdose deaths may be accidental, but some are intentional suicides. If a person becomes severely depressed, he or she may abuse sleeping pills with other drugs to intentionally overdose.
In 2017, 47,173 Americans died by suicide and 13.9 percent of those deaths were caused by poisoning.9 Although an overdose can occur with a high dose of sleeping pills, a deadly overdose caused by sleeping pills is much more common when alcohol is involved.
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https://www.novarecoverycenter.com/substance-abuse/can-you-die-from-sleeping-pills/