Synonyms of 'sleepiness'
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There was a heaviness in the air that stunned them.
Lethargy is the condition or state of being lethargic.
Symptoms include tiredness, paleness and lethargy.
Torpor is the state of being completely inactive mentally or physically, for example because of illness or laziness.
The sick person gradually falls into a torpor.
Thesaurus for sleepiness from the Collins English Thesaurus
a sleepy quality or state