A recently published controlled study found that in two groups who were deliberately exposed to the cold virus then forced to sleep less than 6 hours a night or more than 8 hours, the group that slept less than 6 hours caught colds at a 4.5X greater rate, which was independent of previous immune system strength, age, socio-economic, and every other variable they tracked.<p>The experimental design seems to be pretty solid, and once these findings are replicated, this is pretty strong evidence that &quot;we&#x27;re not getting enough sleep.&quot;<p><a href="http:&#x2F;&#x2F;well.blogs.nytimes.com&#x2F;2015&#x2F;09&#x2F;02&#x2F;short-sleepers-may-catch-more-colds&#x2F;" rel="nofollow">http:&#x2F;&#x2F;well.blogs.nytimes.com&#x2F;2015&#x2F;09&#x2F;02&#x2F;short-sleepers-may-...</a>