As nouns the difference between sleepiness and adrafinil
is that sleepiness is the property of being sleepy while adrafinil is a mild stimulant of the central nervous system used to relieve excessive sleepiness and inattention in elderly patients.
sleepiness
English
Noun
(-)
The property of being sleepy.
adrafinil
English
Noun
(
-)
(
wikipedia adrafinil)
A mild stimulant of the central nervous system used to relieve excessive sleepiness and inattention in elderly patients.