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Julie is more alert in the morning and her brother Jack is more alert in the afternoon. This difference stems from a difference in the siblings’
(A) sleep cycles.
(B) circadian rhythms.
(C) daily activities.
(D) personalities.
(E) ultradian rhythms.
Spoiler
Answer
(B) circadian rhythms.
Spoiler
Explanation
The siblings have different circadian rhythms, approximately 24-hour cycles in biological and behavioral processes including those that regulate alertness, body temperature, and heart rate. Sleep cycles are an example of an ultradian rhythm, a cycle that happens multiple times a day. The sleep cycle is approximately 90 minutes long, and we cycle through it several times over the course of a night’s sleep. Even though the siblings may differ in terms of their daily activities and personalities, these are unlikely to account for their consistent differences in peak alertness time.
Posted : 15/04/2024 5:13 pm