1. Hormonal disorders.

People who work night shifts have low levels of serotonin, which can lead to irritability, depression and sleep disturbances. The production of insulin and leptin (satiety hormone) also changes. People who work at night suffer from increased appetite and weight gain. All this is due to changes in the levels of these hormones.

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Scientists have explained why people want to sleep, even if they just got out of bed after 8 hours of sleep. According to research, many people in the 21st century suffer from hypersomnia. This is the condition when a person wakes up after 8 hours of sleep, but really wants to take a nap. If these are one-time cases, then there is nothing wrong with that. However, many people suffer from this condition for a long time – from a few days to several months.

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