Definition of sleepiness in US English:



  • The state of being sleepy.

    ‘long road trips cause fatigue and sleepiness’
    • ‘Daytime fatigue or sleepiness is also a risk and could make driving or operating machinery dangerous.’
    • ‘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.’
    • ‘Various subjective measures of fatigue and sleepiness have been developed.’
    drowsiness, tiredness, somnolence, languor, languidness, doziness
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