Which of the following statements about the association between sleep and health is false?
a. During sleep, the balance of hormones, enzymes, and proteins are checked for proper balance, and brain debris is removed.
b. Good nutrition and exercise are more important to a healthy lifestyle than sleep.
c. Natural immune system moderators increase during deep sleep to promote resistance to viral infections.
d. Growth and repair of the body's tissues occur during sleep, which help to prevent certain types of cancer.