How does sleep architecture typically change in early adulthood and what are two potential consequences of chronic sleep deprivation?

How does sleep architecture typically change in early adulthood and what are two potential consequences of chronic sleep deprivation?

• A. Sleep efficiency improves and awakenings decrease; consequences: enhanced cognitive performance.
• B. Sleep efficiency declines slightly and awakenings increase; consequences: impaired cognitive performance and mood disturbances or metabolic risk.
• C. Sleep duration lengthens and REM duration increases; consequences: improved mood.
• D. Sleep becomes more fragmented but overall need remains constant; consequences: no change in risk.

Answer: (B)