Ambien is a benzo derivative, which slows everything down, and he was on at least two opiates, which generally cause respiratory depression. I think there was an antibiotic or two in the mix, too. OTC antihistamines combined with opiates can kick up the effects, so if someone is at a high dose of opiates and takes Benadryl (etc.) it's possible to fall asleep and just stop breathing, especially if there are a bunch of other medications. There's also the possibility of Amiben-induced sleepwalking and ODing on whatever is around.
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