| http://www.w3.org/ns/prov#value | - Upon being alerted, one may feel or say, ???I was asleep just then,??? and such judgments ordinarily are accepted as evidence for identifying a prearousal state as sleep, but such subjective evidence can be at variance with behaviouristic classifications of sleep.More generally, problems in defining sleep arise when evidence for one or more of the several criteria of sleep is lacking or when the e
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