adj. (sleepier, sleepiest)
1. drowsy; ready for sleep; about to fall asleep.
2 lacking activity or bustle (a sleepy little town).
3 habitually indolent, unobservant, etc.
Phrases and idioms:
sleepy sickness encephalitis lethargica, an infection of the brain with drowsiness and sometimes a coma.
Derivatives:
sleepily adv. sleepiness n.