Multiple choice

Which of the following best describes the stability of sleep cycles?

  1. They are innate so they cannot be modified.

  2. They are innate but they can be modified in times of emergency.

  3. They are entirely learned but they are difficult to modify.

  4. They are entirely learned and, thus, they may be easily modified.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sleep cycles are innate biological rhythms controlled by circadian processes, but they can be modified during emergencies or necessary shift work. Option A is incorrect because cycles can adjust. Option C is wrong because sleep cycles are not entirely learned. Option D is incorrect because while modifiable, the changes are not 'easy' and often come with health and performance costs. The correct answer balances the innate nature of sleep cycles with their capacity for modification.

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