Definition of sleepiness in English:

sleepiness

noun

  • [mass noun] The state of being sleepy:

    ‘long road trips cause fatigue and sleepiness’
    • ‘Various subjective measures of fatigue and sleepiness have been developed.’
    • ‘Severe daytime sleepiness is 60 per cent more likely in smokers than non-smokers.’
    • ‘People do not necessarily associate fatigue and sleepiness with falling asleep.’
    • ‘They may wake up frequently at night resulting in sleepiness and fatigue during the day.’
    • ‘Daytime fatigue or sleepiness is also a risk and could make driving or operating machinery dangerous.’
    drowsiness, tiredness, somnolence, languor, languidness, doziness
    lethargy, sluggishness, inactivity, heaviness, lassitude, enervation, torpor, torpidity
    narcosis, narcolepsy
    somnolency, comatoseness, oscitancy, oscitation
    View synonyms

Pronunciation:

sleepiness

/ˈsliːpɪnəs/