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According to 'Survey on Sleep Industry' published by Korea Health Industry Development Institute in 2019

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As of 2016, Koreans' average sleep time was 7 hours and 41 minutes


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being 41 minutes less than OECD countries' average of 8 hours and 22 minutes

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remaining at a low level

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According to Health Insurance Review & Assessment Service's statistics

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Korean insomnia patients are

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increasing from 630,000 in 2019 to 650,000 in 2020

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and 680,000 in 2021

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What would be the reason that modern men cannot get enough sleep

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that they seek for multiple ways to get good and deep sleep?

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The reason would differ from person to person

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but it is also diagnosed that

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the accumulation of fatigue throughout the community is also a social factor

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Especially young workers in their twenties and thirties actively engaging in social life

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being unable to sleep well 

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was effected by the so-called 'fatigue society'

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Like this, the fatigue from work can have adverse effect on every day life as well

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We will go over how to manage such fatigue


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First, let's talk about fatigue concepts

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Fatigue refers to the state in which body and mind are tired due to excessive activity

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It causes a long-term loss of exercise, and sleep and interruption of the internal clock, resulting in the decline of 


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mental and physical performances


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Fatigue is distinguished into physical fatigue, mental fatigue, and emotional fatigue

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Industrial health fatigue means

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fatigue caused from

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excessive mental or physical labor

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and refers to a state in which work efficiency is temporarily decreased

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Shift work refers to a system in which workers are divided into two or more groups

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Occupational accident refers to the death


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 injury or illness of a worker due to an unexpected accident at an industrial site


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As industry becomes more complex and society becomes more advanced, fatigue increases

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making it a new subject of interest in safety and health care

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Job characteristics that increase fatigue include long hours of work, shift work, excessive job demands

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role conflicts, lack of discretion, and lack or social support from colleagues or bosses

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Fatigue affects workers' functional activities directly or indirectly

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Fatigue is a normal response

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but the deterioration of bio-function increases discomfort and weakness,

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response to stimuli weakens

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causing physiological and biochemical changes in all organs of the body

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proven to be a risk factor for chronic diseases like heart disease

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This decline in physical and mental functioning leads to 

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a decrease in motivation for work or in job efficiency

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Fatigue and worker fatigue slow down individual work movements and judgements

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and decreases activeness in interpersonal relationships

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hindering cooperative work and insensitizing labor consciousness

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harming not only the company but also the family and society

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Fatigue also reduces concentration during work of workers working long hours

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and negatively affects safety work behavior that recognizes dangerous situations at work

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becoming a cause of accidents

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Fatigue is also closely related to work patterns

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It is a symptom that is mainly complained of during night work rather than day work

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Causes sleepiness, sleep disorders

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and increases the incidence of occupational accidents 

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making it a major factor that hinders industrial safety

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A tired worker

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might suffer from general symptoms like having no energy, exhausted, feeling heavy

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having hard time waking up in the morning, having no appetite, difficulties in digestion, insomnia

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and weight gain or weigh loss

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Physical symptoms of fatigue include

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heavy head, hard time breathing, general malaise

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pain in arms and legs, bradykinesia, rigidity and relax of joints

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As for mental symptoms of fatigue there are

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dizziness, decrease in attention span, psychological instability, etc.

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If fatigue symptoms get worse

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muscle pain, shortness of breath, abnormal sweating, digestive problems

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headaches and dizziness may occur

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Among the contributing factors to fatigue

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The first work-related factor is the workload

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In terms of work method, work posture, work flow, operation method, order of motion, muscle work

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and in terms of work density, things like work speed, energy use, attention and tension

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and work demands have an impact

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The second contributing factor, working environment conditions include physical environment and social and psychological environment

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Physical environment refers to lighting, noise, vibration, ventilation, temperature conditions etc.

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Social and psychological environment refers to environments like job stress

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The third contributing factor is work organization and time

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Work organization is affected by strictness of work management, whether there is regulation or autonomy, and whether the responsibility is shared

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And working hours are affected by continuous working hours per day, improper breaks, improper working schedules and shifts

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and insufficient recovery time between shifts

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Other factor include excessive commuting hours, additional work after work

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and frequent or long staff dinners that last until late hours

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There could be other personal factors

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In terms of age, it would be more difficult to adjust to night shifts if you're older

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Diseases or health conditions that have fatigue as the main symptoms

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Such as


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obesity, anemia, tuberculosis, depression, stress, diabetes, pregnancy, hypothyroidism, heart disease

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chronic fatigue syndrome, etc.

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And drug side effects like


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some antihypertensive drugs, most tranquilizers, anti-inflammatory pain medications, anti-convulsants

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adrenocortical steroids, cold medicines, oral contraceptives, etc. could affect fatigue

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Also, excessive drinking and smoking, lack of physical activity

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and lack of sleep and rest due to social activities and family life have impact as well

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And in terms of personal personality, perfectionism, confidence, type A personality, emotional instability

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and introversion can be cited as personal factors

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Looking at the effects of fatigue

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sleep deprivation due to fatigue can lead to sleepiness, poor judgement, decreased reaction speed, increased mistakes

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and increased damage

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workers who feel tired have safety and health-related behavior changes

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and lower concentration, reducing work efficiency and increasing industrial accident rates

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Therefore, in the case of workplaces where many workers feel tired

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the overall productivity of the workplace decreases

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Due to the increase in the absenteeism rate, turnover rate, and accident rate of workers