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What is “shift work”? The very basic way to describe it when a work schedule is not fitted within normal 9 to 5 . It can also mean that the hours performed by an individual are more than normal 8 hour working day.

In the last few years because of the economic growth we are developed into so-called “24 hour/day society”.  The latest survey says that about 20% pf people are doing alternating shifts. But the recent trends prove that the number of these people, especially in some areas of trade, is in rise.

People doing shift work tend to take more sick leave and also have the increased risk of developing some diseases such as ulcer or heart disease. Women working night shifts are more likely to develop problems with periods or difficulty with pregnancy.

Unfortunately sleep disorders do not only effect the night hours, they also have a major impact on the day activities as well, such as our mental well-being, the level of stress, our productivity, and the safety.

About two-thirds of travellers report having jetlag. Symptoms of jet-lag include daytime tiredness, difficulty initiating sleep at night (after eastward flight) or early awakening (after westward flight), disturbed night-time sleep, impaired daytime alertness and performance, gastrointestinal problems, loss of appetite, and inappropriate timing of defecation and urination.

Such symptoms can seriously impair a person’s performance and ability to function, in part because of the reduction in sleep quality and quantity, and because performance and alertness rhythms will take several days to resynchronise. In the long-term (eg, after 4 years), chronic disruption of circadian rhythms from regular transmeridian travel might result in cognitive deficits (decreased short-term memory, slower reaction time) and changed physiological parameters (such as cortisol concentrations).

Because of their rapidly changing and conflicting light-dark exposure and activity-rest behaviour, shiftworkers can have symptoms similar to those of jetlag. Although travellers normally adapt to the new time zone, shift-workers usually live out of phase with local time cues.

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