Which stage of sleep accounts for the greatest proportion of total sleep time in adults?
a. 1
b. 2
c. 3
d. 4
B
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A Stage 1 does not account for the greatest proportion of total sleep time in adults.
B Stage 2 accounts for the greatest proportion of total sleep time in adults, as it comprises 45% to 55% of total sleep.
C Stage 3 does not account for the greatest proportion of total sleep time in adults.
D Stage 4 does not account for the greatest proportion of total sleep time in adults.
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