A new study carried out in the United States of America has shown that persons who had six hours or less sleep in the night were more prone to common cold than those who had seven or more hours. The study involved 164 volunteers who were given wrist sensor to measure the duration of sleep, infected with rhinovirus through nasal drops and quarantined in a hotel for 5 days under close observation to see who got cold.
The result showed that those who had less than seven hours of sleep irrespective of the quality of sleep, age, race, stress level, income, education and smoking habit were more prone to common cold.
The study supports the theory that poor sleeps reduces immunity.

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