Fyang powder was a substance often used by Utu-Noranti Pralatong. It was a potent dust that can cause even the nigh-impenetrable Scarrans to fall asleep instantly. Its effect was inversely proportional to the weight of the subject inhaling it, so to effectively knock out a Scarran, one must have a large amount of the powder. Noranti used Fyang powder multiple times; to knock out a berserk Scorpius, to render attacking Scarrans unconscious, and to stop John Crichton from shooting Ka D'Argo in the grip of a drugged hallucination.
It is possible that too much handling of Fyang powder is the cause of Noranti's narcolepsy.