Scientists believe that dreams are the result of the combined action of various central points in the brain that are responsible for various functions of the human body. Some people's brain cells are still active during sleep, which is the basis of dreams. Recent research results have confirmed that dreaming is not only affects people's sleep and health, and is one of the physiological activities necessary to protect the health of the brain. Which of the following, if true, would best support the above conclusion? ['In the study, subjects who were disturbed by dreams appeared anxious, easy to be nervous, and had short-term impairment of memory after waking up.', 'According to the questionnaire analysis, people who have not dreamed for a long time need longer sleep than regular dreamers, and half of them still feel tired after resting.', 'Surveys show that subjects who can fully describe dreams can focus more quickly at work than forgetful dreamers, resulting in more efficient work.', "In the experiment, when the sleeper appeared dreaming brain waves, they immediately blocked them, and found that the subjects' blood pressure and body temperature increased significantly."]