Does the "forbidden zone" for sleep onset influence morning shift sleep duration?

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      <subfield code="a">Does the "forbidden zone" for sleep onset influence morning shift sleep duration?</subfield>
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      <subfield code="t">Ergonomics</subfield>
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      <subfield code="g">Vol. 36, nº 1-3, January-March 1993 ; p. 85-91</subfield>
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