Insomnia is considered a risk factor for adverse effects of physical and mental health. Usually, we only want to sleep 8-10 hours a day, but people with insomnia to sleep less than normal. So there is cause and effect, as some people like to sleep 9-10 hours to feel safe. On the other hand some people sleeping only 5-6 hours is enough for him. Thus, people with insomnia may have slept longer than these people it is not.
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