Each of these environmental factors appears to worsen the sleep/wake shift except
a. starting school earlier in middle and high school than in elementary school.
b. abuse of melatonin supplements by teens.
c. staring at lighted screens (TVs, computers, video games, and cell phones) late at night.
d. greater autonomy over their bedtimes granted to teens by their parents.
Answer: b. abuse of melatonin supplements by teens.
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