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108. Eighty percent of our sleep takes place in which cycle of sleep?

(A) Stage 1
(B) Stage 2
(C) Stage 3
(D) Stage 4
(E) All of the above

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Final answer:

Option (E), Eighty percent of our sleep occurs across all of the non-REM stages of sleep, including Stage 1, Stage 2, and the deep sleep stages of 3 and 4 combined.

Step-by-step explanation:

The question is asking about the sleep cycle during which the majority of our sleep occurs, which is Stage 2 sleep. According to the information provided, during Stage 2 sleep, sleep spindles and K-complexes emerge, indicating that the body is going into a deeper relaxation phase. Sleep research suggests that we spend about 50% of our sleep time in Stage 2, making it the stage where the largest percentage of our sleep occurs, but not quite 80%.

However, if we accumulate the time spent in all non-REM stages of sleep, which includes Stage 1, Stage 2, and slow-wave sleep (Stages 3 and 4), it may indeed comprise around 80% of our overall sleep time, with the remaining 20% being REM sleep. Therefore, the correct answer addressing the 80% question would be (E) All of the above, if we consider all non-REM stages collectively.

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