Final answer:
The finding that was NOT one of the findings regarding research on sleep and dream deprivation is that people who are deprived of REM sleep are at greater risk of developing a mental illness.
Step-by-step explanation:
The finding that was NOT one of the findings regarding research on sleep and dream deprivation is option c: People who are deprived of REM sleep are at greater risk of developing a mental illness.
Research has shown that if people are deprived of REM sleep and then allowed to sleep undisturbed, they will spend more time in REM sleep in what would appear to be an effort to recoup the lost time. This is known as REM rebound. Furthermore, missing any sleep stage can cause a rebound for that stage, indicating that sleep stages are homeostatically regulated.
Daytime disturbances are related to the total amount of sleep lost, not to the type of sleep lost. Sleep deprivation in general is associated with negative consequences, including depression-like symptoms, obesity, increased blood pressure, increased levels of stress hormones, reduced immune functioning, and impaired cognitive and motor function. The most severe effects of sleep deprivation occur after staying awake for more than 24 hours or experiencing repeated nights with fewer than four hours of sleep.