41. A person who normally sleeps eight hours a night sleeps less than five hours for two consecutive nights. On the next night, the person sleeps about nine hours. What is most likely to occur in that nine-hour night?
Answer: B
An increase in the relative percentage of slow-wave sleep (SWS)
After experiencing sleep deprivation for two consecutive nights, a person is likely to experience an increase in the relative percentage of slow-wave sleep during the next night of extended sleep. This compensatory mechanism helps the body recover from the effects of prior sleep loss.
A) An increase in the relative percentage of NREM sleep
While it is true that slow-wave sleep (which is part of NREM sleep) may increase, this option is too broad. The focus on slow-wave sleep (SWS) specifically captures the compensatory response after sleep deprivation, making this option less precise in answering the question.
B) An increase in the relative percentage of slow-wave sleep (SWS)
This option is correct as it directly addresses the body's physiological response to previous sleep deprivation. Research indicates that following periods of reduced sleep, individuals tend to experience a rebound in slow-wave sleep, which is crucial for restorative processes.
C) An increase in the relative percentage of REM sleep
Although REM sleep plays an important role in overall sleep architecture, the immediate response to sleep deprivation typically does not prioritize REM sleep. Instead, the body compensates by increasing slow-wave sleep first, making this option incorrect.
D) More frequent awakenings during the night
This option is unlikely as the body aims to consolidate sleep to recover from deprivation. Instead of experiencing more awakenings, the person is expected to achieve deeper and more restorative sleep, which would minimize interruptions.
Conclusion
The increase in the relative percentage of slow-wave sleep (SWS) is a well-documented physiological response to sleep deprivation, making it the definitive correct answer. Other options either generalize too broadly or misinterpret the body's compensatory mechanisms following periods of insufficient sleep. Thus, option B accurately reflects the most likely occurrence during the extended sleep following sleep loss.