醒

stimulant (e.g. psychoactive drugs like methamphetamine, ritalin, etc.)

stimulant effect (e.g. caffeine)

Great Awakening (18th century American Christian revival movement)

sleep-wake cycle

wakefulness

level of awakeness

hyperarousal (symptom of PTSD)

warning

half asleep and half awake

half awake and half asleep

a teetotaler doesn't know (how tasty) water is when waking up after having been drunk

awakening

to have one's fun spoiled

hyperarousal (symptom of PTSD)

waking up