Our Sleep Rhythms Tend to Follow an Exact 24-Hour Day

question 649

Multiple Choice

Our sleep rhythms tend to follow an exact 24-hour day because

• A)the time of peak activity is invariant from person to person.
• B)they are tied to external time markers like light and dark.
• C)they have adapted to technological improvements made in the last century.
• D)everyone needs at least eight hours of sleep every night.

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