From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
59 Moby Thesaurus words for "sleepiness": acedia, apathy, boredom, brain fag, debilitation, debility, drowsiness, dullness, enervation, enfeeblement, ennui, eyestrain, faintness, fatigue, goneness, heart strain, heaviness, hebetude, inanimation, indifference, jadedness, lackadaisicalness, languidness, languishment, languor, languorousness, lassitude, lenitude, lentor, lethargy, lifelessness, listlessness, mental fatigue, mental strain, oscitancy, overstrain, overtiredness, passivity, phlegm, satedness, sloth, slothfulness, slowness, sluggishness, somnolence, stance fatigue, strain, stupefaction, stupor, supineness, tiredness, torpidity, torpidness, torpitude, torpor, weakness, wearifulness, weariness, world-weariness
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