If ingested your pet could become weak, ill and may even go into a coma possibly resulting in death from respiratory failure. (boyetteanimalhospital.com)
I don't exactly remember the first time I had it, probably because I likely went into a coma of bliss and was out for a few days. (beamingbanana.com)
Obviously, because otherwise we would be at risk for going into a coma at night. (onnit.com)