" is a lonely life in and out of work. You work alone, and when you have a day off, all are working friends." The benefits of night work include a high degree of satisfaction with employment status and a minimum subjective deterioration. A disadvantage of night work is that it is considered physiologically harmful, as many body functions follow a circadian rhythm , which is e l sleep-wake cycle is repeated as a constant in our lives, which is governed by a "biological clock " itself that dictates when to wake up and when to sleep. The circadian cycle spanning 24 hours, divided into eight to 16 for sleep and wakefulness. Consider further that During the day our biological parameters are natural constants (temperature, heart rate, oxygen consumption, etc.) That are different from those of the night, which is also part of the circadian cycle. 
night work occurs a mismatch of their natural circadian biological rhythms. This desynchronization is translated more prone to fatigue. Another contributory cause of fatigue is cyclic distortion of sleep that night worker suffers because daytime sleep is not restorative features of sleep a night. If all this we add the effects of the desynchronization time is about balancing social and family life, we can ensure that the disorders suffered by a worker at night are the result triple biological conflict, employment and socio-family member who is subject.
Some studies performed to determine whether cognitive and psychomotor functions required for the job are more impaired in rotating shifts to night shifts and risk of accidents. In terms of performance, both rotating shift workers and night workers presented no differences at the beginning and end of their shifts. Conlcuyen studies, then, to work on night shifts, voluntrariamente elected, they would then immediate negative effects on performance cognitive or motor skills.
On the other hand, other studies claim that it has been found that night shifts may exacerbate cardiovascular disorders (said of a risk of up to 40% of cardiovascular disease) and disrupt biological functions leading to reduced immune defenses, all expressed in the long term (retirement). It also describes nervous disorders associated with fatigue, sleep disturbances, gastrointestinal disturbances and loss of appetite. In addition, it is said that every 15 years of age prematurely nocturnal about 5.
describe a modification of the physiological functions of human body which is adapted initially more active during daylight hours and therefore at night occurring phenomena such as the decline in T ยบ body decreased attention span and speed of movement, decreased blood pressure.
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