Lack of sleep weakens the immune system, making people more susceptible to illness. Getting less than seven hours of sleep increases the likelihood of catching a cold. Oversleeping can also lead to health problems. Doctors recommend seven to eight hours of sleep for adults and nine hours for children and adolescents.
Getting less sleep than a person should can cause a weakened immune system, increasing the chances of getting sick. Some experts point out that if a person gets only five hours of sleep a night over a five-day period, their immune system is weakened by 50%. One study showed that participants who got less than seven hours of sleep a night and then were exposed to a cold virus were three times more likely to get a cold than study participants who got at least eight hours of sleep a night.
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Doctors recommend that the average adult get seven to eight hours of sleep each night. Children and adolescents should be given at least nine hours.
During sleep, people produce substances called cytokines that are essential for fighting infection. Less sleep means fewer cytokines, increasing a person’s susceptibility to disease.
Adults who sleep too much are generally at a higher risk of developing health problems such as obesity, depression and heart problems. Oversleeping in adults is defined as more than nine to ten hours a night.
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