John is blind and is therefore unable to detect the light that normally sets the suprachiasmatic nucleus (SCN). If he is like most totally blind people:
A)his sleep-wake, body temperature, and melatonin circadian rhythms can become desynchronized.
B)he will suffer from attacks of cataplexy, especially when he is emotionally aroused.
C)he will use sign language and tend to "sleep sign" during stage 4 NREM sleep when sleep talking typically happens.
D)his REM sleep will consist of very vivid visual dreams most of which will be lucid dreams.

Question

Quizplus · Accepted Answer

The SCN is responsible for regulating the sleep-wake cycle, body temperature, and melatonin production, which are all components of circadian rhythms. Without input from light, the circadian rhythms of a blind person can become desynchronized.

John Is Blind and Is Therefore Unable to Detect the Light