Increasingly, researchers tell us, it´s clear that "short sleeping" can get us into plenty of trouble healthwise. Insufficient sleep is linked not only to obesity—which brings its own set of health issues—but also to a host of other maladies.
According to a study in the journal Diabetes in 2011, University of Chicago and Northwestern University researchers found that when people with type 2 diabetes slept poorly at night, they had a 9 percent higher fasting glucose level, a 30 percent higher fasting insulin level, and a 43 percent higher insulin resistance level. Diabetics with insomnia fared even worse—their fasting glucose levels were 23 percent higher, their fasting insulin levels were 48 percent higher, and their insulin resistance levels were 82 percent higher than diabetics who didn´t have insomnia.
Researchers at Tohoku University Graduate School of Medicine in Sendai, Japan, studied data from nearly 24,000 women ages 40 to 79, and learned that those who slept fewer than 6 hours a night had a 62 percent higher risk for breast cancer, while those who slept more than 9 hours a night had a 28 percent lower risk.
In findings presented at the May 2011 meeting of the American Urological Association, researchers at the New England Research Institute in Watertown, Massachusetts, reviewed data from 4,145 middle-aged men and women and here´s
Five years of sleeping restlessly or too little (fewer than 5 hours a night) can increase by 80 to 90 percent a woman´s risk of needing to wake at night to urinate (nocturia) or of becoming incontinent. A whopping 42 percent of the women classified themselves as restless sleepers, compared with 34 percent of the men. The researchers theorize that sleeping poorly causes inflammation, which in turn can lead to urinary problems.
In a study of 1,240 people published in 2011, Case Western University researchers found that those who slept fewer than 6 hours a night were 47 percent more likely to have colorectal polyps, which can become cancerous, than people who clocked at least 7 hours of sleep.