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Sleep Cycles Across the Night
Grade Level
Psychology
PSY.110 Sleep Cycles Across the Night
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Use the sleep graph for this item. The graph shows N3 for 40 minutes in Cycle 1, 18 minutes in Cycle 2, 12 minutes in Cycle 3, and 0 minutes in Cycle 4. Which interpretation is most precise?
A
N3 increases by the same amount in every cycle.
B
N3 stays constant until it disappears suddenly at the end.
C
N3 generally decreases, though the biggest drop occurs between Cycle 1 and Cycle 2.
D
N3 is absent from Cycle 1 but longest in Cycle 4.
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