Good Night’s Sleep Puts Colds to Bed
Sleeping 7 or More Hours a Night May Help Prevent the Common Cold
WebMD News Archive
Jan. 12, 2009 -- Getting a good night’s sleep may be one of the best ways to
prevent the common cold.
A new study shows that people who sleep less than seven hours per night are
three times more likely than those who sleep at least eight hours to catch a
common cold after being exposed to a cold-causing virus.
Researchers say it’s been commonly thought that poor sleep increases your
chances of coming down with the common cold, but until now there has been
little scientific evidence to support that notion.
Sleep Fights Colds
In the study, published in the Archives of Internal Medicine,
researchers studied 153 healthy men and women. Each of the participants kept
track of their sleeping habits for 14 days, noting how long and how well they
slept the previous night as well as whether they felt rested.
After 14 days, the participants were quarantined, given nasal drops
containing a cold-causing virus (rhinovirus), and monitored for five days for
signs of a common cold.
The results showed that those who slept an average of less than seven hours
per night were nearly three times more likely to develop a common cold than
those who reported eight or more hours per night in the weeks leading up to the
Quality, Not Quantity Matters
But it wasn’t just about how much time they were spending in bed. Researcher
Sheldon Cohen, PhD, of Carnegie Mellon University, and colleagues found the
percentage of time spent actually asleep was especially important.
For example, those who spent 92% of their time in bed asleep were five and a
half times more likely to develop a common cold than those who spent 98% or
more of their time in bed sleeping.
Feeling rested, however, was not associated with getting a cold.
Researchers write that "these results strongly suggest the possibility
of sleep playing a causal role in cold susceptibility."