I've read many failed attempts and I don't think I've seen a single one where SN failed without medical intervention (assuming proper lethal dose was ingested). I could be remembering incorrectly. But I don't think it's possible to drink 20g+ of SN and just, like, wake up okay some hours later. You either get treated medically or you die. Again, I could be wrong, but I've read many failed attempts and this seems to be the case.