A patient with insomnia has a sleep efficiency of 62% over the past two weeks, sleeping an average of 5.5 hours in a 9-hour time in bed window. What initial sleep window should the therapist prescribe using sleep restriction?
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A
5.5 hours, but no less than 5 hours
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B
6.5 hours to allow buffer time
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C
9 hours to match current time in bed
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D
8 hours based on normative recommendations