the demon of typhoid fever (tuphos, tuphomanie, tuphodes puretos), which is often associated with raving delirium, confused sensual dreams (nightmares), intoxication, and stupor, also seems to have been identified or confused with the nightmare demon Ephialtes.
This passage argues that Typhos, etymologically rooted in 'smoke or fumes,' was historically conflated with the nightmare demon Ephialtes and with fever-induced delirium, situating Typho within a cluster of oneiric and somatic disturbances central to Pan's domain.
, Pan and the Nightmare, 1972thesis