Which of the Following Statements Is True of Sleep in Middle

Multiple Choice

Which of the following statements is true of sleep in middle age?

A) An increasing number of experts note that 11 hours of sleep or more per night are necessary for adults to perform optimally the next day.
B) Habitual sleep deprivation in adults is linked to morbidity, especially among people with cardiovascular disease.
C) Sleep-disordered breathing and restless legs syndrome become less prevalent in middle age.
D) The total number of hours slept usually varies, but beginning in the 40s, wakeful periods are less frequent and there is more of the deepest type of sleep.