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Environmental Psychology

Strategies for reducing the effects of jet lag and shift work

  • 3 things to know
  • Component 03

Overview

Recall questions on strategies for reducing the effects of jet lag and shift work, including forward rotation, bright light, melatonin, strategic napping, caffeine, protecting daytime sleep, preparing for time zone changes, advising workers and travellers, and individual differences.

What you need to know

Answer each one before you reveal it.

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Key term

Why should a shift rotation move forwards rather than backwards?

Key term

How can bright light be used to help night workers?

Key term

Name two ways of protecting daytime sleep after a night shift.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Name three features of a shift schedule designed around circadian principles.

    Model answer

    Rotating shifts forwards from mornings to evenings to nights, changing shift less often, and allowing enough rest days at each changeover.

  2. 2

    Why should a shift rotation move forwards rather than backwards?

    Model answer

    The body clock naturally runs slightly longer than 24 hours, so delaying the sleep period is easier to adapt to than advancing it.

  3. 3

    How can bright light be used to help night workers?

    Model answer

    Bright light during the night shift suppresses melatonin and shifts the clock later, while dark glasses on the journey home and blackout blinds afterwards protect daytime sleep.

  4. 4

    How is melatonin used to manage shift work or jet lag?

    Model answer

    A small dose taken at the target bedtime acts as a chemical zeitgeber that shifts the clock towards the new schedule and helps sleep begin at the right time.

  5. 5

    Give one drawback of using melatonin.

    Model answer

    Its effect depends on precise timing, so taking it at the wrong hour can shift the clock the wrong way, and long-term safety and dosage are not well established.

  6. 6

    What is strategic napping, and why does it help night workers?

    Model answer

    It is a planned nap of around 20 minutes taken before or during a night shift, which reduces sleep debt and restores alertness without producing the grogginess that follows deep sleep.

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