The noun "sleep" can be both countable and uncountable.
sleep → uncountable
Meaning: a natural state of rest
Example sentence: Fish and reptiles also need regular periods of sleep.
sleep → countable
Meaning: a particular period of sleep
Example sentence: If I wake up too early in the morning, I have a short sleep after lunch.
In which sentence is the word "sleep" uncountable?
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Contributor: Matt Errey