28. According to the second paragraph, the side effects of drugs for insomnia _____.
(A) will always be a problem as long as insomnia is a problem in our society.
(B) include drowsiness during the day and risk of dependence, even addiction.
(C) may cause one to fall asleep at any moment of the day.
(D) only affect those who have high levels of stress or don't eat a healthy diet.