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Many pilots will prefer to fly sessions in the simulator during the day rather than at night time, due to the circadian body rhythm. What is correct about the effect of the body temperature's circadian rhythm?
  • A
    The changes in body temperature do not affect performance. Rather it is a lack of sunlight that triggers a sleep response and lowers performance.
  • B
    The changes in body temperature allow for improved rest during scheduled short sleep periods during the day.
  • C
    Falling asleep is easier when the body temperature is rising, as compared to when it is falling.
  • D
    When the body temperature is falling it is harder to work, than when it is rising.

Body Temperature and Sleep

There is a direct relationship between our body temperature and sleep cycle.

At the time of lowest body temperature, we find it hardest to stay awake. We will start to feel sleepy at a time when the temperature is falling and be at our most wide awake when the temperature is rising.

Body temperature variations throughout the day follow a regular cycle. The highest temperature occurs around 1700 hours and the lowest at about 0500 hours, at which time we are least efficient and the desire for sleep is at its peak.

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