The following statements about sleep are true EXCEPT

(A). Melatonin is secreted from penile body. Two sleep cycles; the slow-wave sleep (SWS) (i.e., n3, delta, or deep sleep) appears to be the most restorative form of sleep; it is entered into relatively quickly after sleep onset, it is preserved in the face of reduced total sleep time, and it increases (rebounds) after a night of restricted sleep. Rapid eye movement (REM) sleep (stage r or "dream" sleep) appears to be involved in (1) completing vital cognitive functions, such as the consolidation of memory; (2) promoting the plasticity of the central nervous system (CNS); and (3) protecting the brain from injury.