Narcosis is just a term that means unconsciousness or stupor caused by any narcotic, of which most are derived from opiates (excluding synthetics). Essentially, opiate narcosis is that state in which the user has fallen into a state of unconsciousness, stupor, or in some cases, delirium, either by deliberate or accidental overdose.
It is not uncommon in patch patients, as increased activity raises body temperature and heart rate, which in turn increases the patch's dosage delivery rate. If the user isn't aware or careful of this fact, over-dosage to the point of delirium or unconsciousness is often the result.
Narcolepsy is a recognised medical/psychological condition. Sufferers can literally fall asleep without warning. They can be in mid sentence, or even operating machinery, and they'll instantly 'nod off' for anything from a few seconds to minutes or hours.
== == Narcosis is a drug induced stupor.