John Is Blind and Is Therefore Unable to Detect the Light

question 286

Multiple Choice

John is blind and is therefore unable to detect the light that normally sets the suprachiasmatic nucleus (SCN) . If he is like most blind people:

• A) his sleep-wake, body temperature, and melatonin circadian rhythms may 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 sleeptalking typically happens.
• D) his REM sleep will consist of very vivid visual dreams, most of which will be lucid dreams.

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