The Sleep Researcher William Dement Awakened Volunteers Each Time They

The sleep researcher William Dement awakened volunteers each time they entered REM sleep.He found

A) that by the fifth night, many of the volunteers had to be awakened 20 to 30 times to prevent REM sleep.
B) that during their waking hours, the volunteers who were deprived of REM sleep complained of memory lapses, poor concentration, and anxiety.
C) that when the volunteers were finally allowed to sleep undisturbed, they dreamed extra amounts.
D) all of these to be true.