Which of these is true during the process of falling asleep?
A. The SCN tells the pineal gland to start producing melanin during waking hours.
B. External light cues the SCN to signal the pineal gland to secrete melatonin which induces relaxation and sleepiness.
C. Melatonin starts to secrete about 10 pm, the SCN then inhibits the pineal gland and pituitary to induce sleepiness.
D. The SCN tells the pituitary gland to secrete epinephrine; the pineal gland secretes melatonin to inhibit the epinephrine.