After merton has been sleeping for about ninety minutes, his heart begins to beat faster, his breathing growsfast and irregular, and his closed eyes begin to move back and forth. merton is most likely experiencinga. a night terror. b.rem sleep. c.sleep apnea. d.stage 4 sleep.

Merton is most likely experiencing REM sleeping.

Explanation: REM sleeping known as rapid eye movement (REM) sleep is characterized by rapid eye movement of sleep during which most brain activity and dreams occur. It is BGC also known as paradoxical sleep (PS) and sometimes desynchronized sleep because of similarities to waking states. This sleep is characterized by irregular breathing, fast heart rate and lasts about 90 minutes.

answer; acquired mainly during early childhood;