Millions of people around the world work a night shift. But simply staying awake during the shift, let alone maintaining the concentration and the alertness necessary to avoid mistakes can be an enourmous problem. Now scientists, led by Dr Charles Czeisler at Harvard Medical School, have found that controlled exposure to bright lights can help workers overcome the 'night shift blues'. Exposure to light resets the biological clock that regulates our sleep and awake periods. The research has been developed into a commrcial system by ShiftWork Systems Inc in America. Shift workers employed by companies using the system reprot benefits of improved alertness, less fatigue and better daytime sleep after just one shift.

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Dr Charles Czeisler, circadian rhythm researcher

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Dr Charles Czeisler, circadian rhythm researcher
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Radiographer performing a PET brain scan

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Radiographer performing a PET brain scan
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PET brain scan

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PET brain scan
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Patient undergoing a PET brain scan

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Patient undergoing a PET brain scan
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PET scan of a brain during normal sleep

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PET scan of a brain during normal sleep
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Brain in REM sleep

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Brain in REM sleep
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Coloured PET scan of human brain during NREM sleep

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Coloured PET scan of human brain during NREM sleep
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Colour PET scan of brain during sleep deprivation

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Colour PET scan of brain during sleep deprivation
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Coloured PET scan of human brain which is awake

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Coloured PET scan of human brain which is awake
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Coloured PET scan of brain during drugged sleep

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Coloured PET scan of brain during drugged sleep
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Circadian Light Visor used to treat sleep disorder

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Circadian Light Visor used to treat sleep disorder
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Circadian Light Visor used to treat sleep disorder

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Circadian Light Visor used to treat sleep disorder
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Circadian rhythm researcher samples human blood

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Circadian rhythm researcher samples human blood
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Circadian rhythm research: wired patient asleep

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Circadian rhythm research: wired patient asleep
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Circadian rhythm research: wired patient asleep

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Circadian rhythm research: wired patient asleep
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Control room at San Diego power plant, USA

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Control room at San Diego power plant, USA
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