Why tired people get sick

Sleep deprived people are more than four times more likely to catch a cold than those who get plenty of shuteye, scientists report.

The US researchers report that those who sleep fewer than five hours a night are 4.5 times more likely to get sick than those who sleep seven hours or more.

This is based on a two-part experiment in which they collected nightly sleep data on 164 healthy people for one week

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