Answer: D. Bruno is demonstrating REM sleep.
Step-by-step explanation:
D. Bruno is demonstrating REM sleep.
When someone is sleeping, but their eyes are moving quickly, it is a characteristic sign of Rapid Eye Movement (REM) sleep. During REM sleep, people experience vivid dreams, and their eyes move rapidly behind their closed eyelids. This is in contrast to Non-Rapid Eye Movement (NREM) sleep, where eye movement is typically slower or absent. Night terrors are more associated with NREM sleep, and the biological clock not working is a less likely explanation for the observed phenomenon.