Which of the following is/are necessary in order to stay precisely synchronized, or entrained, to a 24-hour-day?
A)medication
B)long periods of darkness
C)exposure to environmental time signals
D)naps

Question

Quizplus · Accepted Answer

Exposure to environmental time signals, such as sunlight, is necessary in order to stay entrained to a 24-hour-day. Without these signals, our internal body clocks can become desynchronized from the external environment, leading to sleep disturbances and other health problems. Medication and naps are not necessary for entrainment, while long periods of darkness can actually disrupt entrainment.

Which of the Following Is/are Necessary in Order to Stay