Which of the following would you expect to see if you were to observe Erika's brainwave patterns for a night or two after she started sleeping better?

Question

Quizplus · Accepted Answer

REM rebound is a common occurrence after a period of poor sleep, where the individual experiences an increase in the amount and intensity of REM sleep to make up for lost REM sleep. This would be expected if Erika started sleeping better after a period of poor sleep.

Answer: B, D, and possibly C are incorrect. 
 Absence of sleep spindles (B) is not necessarily tied to improved sleep, and 90 percent of sleep time spent in alpha waves (C) is not a typical pattern seen in healthy sleep. No evidence of dreaming (D) is also not a sign of improved sleep, as dreaming (especially during REM sleep) is a normal part of the sleep cycle.

Which of the Following Would You Expect to See If