Q9. Less than 6 hours sleep increases the risk to catch a cold. True or False?
A9. In the newest research, people who sleep less than 6 hours caught a cold about 4 times as many as people who sleep more than 7 hours.
In the non-REM sleep state, which is a state of complete rest, growth hormone is secreted and the immune system that is tired from a fight against viruses is repaired. That means sleeping makes the immune system more powerful.
But too much sleep doesn't help the immune system because even if you sleep longer, your non-REM sleep doesn't get longer. In the research, 7 to 8 hours sleep was the best to boost up immune system.
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