Sleep inertia refers to a period of
A
heightened alertness and visual acuity following a rest period.
B
alignment between a person's internal biological clock and local external time cues.
C
impaired performance following awakening from a regular sleep cycle or nap.✓ Correct Answer
Explanation
Sleep inertia is the temporary period of grogginess and impaired performance immediately after waking from sleep or a nap, which can last many minutes. Alignment with local time cues describes circadian adjustment, and it is not a period of heightened alertness.
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