Which of the following is a possible reason most growth hormone release happens during slow wave sleep?

A. Because sleep helps rebuild or restore materials used during waking, such as proteins
B. Because the body only heals when a person is asleep and growth hormone promotes healing
C. Because the pineal gland, which secretes growth hormone, is most active at night
D. Because a specific growth hormone called GABA is released by neurons that become active at sleep onset