1. Low Fertility Levels
According to studies carried out on Korean women who were undergoing through in vitro fertilization, participants in the study who slept for between seven and eight hours were found to have better chances of conceiving. In the study, women who slept for the recommended hours were found to have a higher rate of conception at 53% compared to women who slept for less than hours who had a conception rate of 46%. Women who slept longer than the recommended hours were found to have a 43% chance of getting pregnant. According to the facilitators of the study, data suggested that sleeping for longer than the recommended hours could be affecting the circadian cycle and hormone production of women hence leading to lowered fertility levels.
2. Low Tolerance to Glucose
Tolerance to glucose refers to the ability of the body to process sugars. People who are tolerant to glucose often have insulin resistance which is a predisposing factor to heart disease and type 2 diabetes.
According to a Canadian lifestyle study carried out over a period of six years and involving 276 participants, people who slept above or less than the recommended hours had a 20% chance of becoming intolerant to glucose and contracting diabetes. This is compared to normal sleepers who only had a 7% of developing these issues. A recent review of the studies carried out on the correlation between diabetes and sleep patterns showed that people who sleep less or more than the recommended hours were at a higher risk of contracting type 2 diabetes.
3. Increase in Weight
The six-year Canadian study also showed researchers that there was a relationship between gain of weight and sleep patterns. Over the period of the study, long and short sleepers were found to have gained an average of 1.98 kgs. On the other hand, normal sleepers were found to have gained an average of 1.58 kgs. People who slept for more than 9 hours were found to have a 21% chance of becoming obese compared to normal sleepers.
Other studies done by researchers have suggested that short sleepers are more likely to have a higher body weight. Long sleepers are also likely to have a higher weight gain because of predisposing factors such as diabetes.
4. A Higher Risk of Contracting Heart Diseases
Based on data collected from the National Health and Nutrition Examination Survey (NAHNES), researchers were able to find a higher risk of stroke and heart diseases for both short and long sleepers. The data indicated that people who sleep for more than eight hours twice as likely to develop angina (A condition that refers to chest pains caused by reduced flow of blood). Further, they were also 10% more likely to develop coronary diseases.
After analyzing data from the Nurses’ Health Study which involved over 71,000 middle-aged women, researchers were able to conclude that there was a relationship between the duration that one sleeps and their heart health. Compared to women who had normal sleeping patterns, participants who slept for between nine and eleven hours were found to be 38% more likely to develop coronary diseases.
5. Increased Risk of Stroke
In a recent study done over a period of 11 years on 9,700 Europeans by researchers from the University of Cambridge, participants who slept for more than eight hours were found to be 46% more likely to get a stroke during the period of the study after an adjustment had been done on comorbid factors. During the study, people who increased their hours sleep were found to be four times more likely to get a stroke compared to participants who had consistent sleep patterns. This essentially suggests that longer sleep could be a warning sign of increased risk to getting a stroke.
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