An investigation led by Dr. Tomohide Yamada of the University of Tokyo in Japan presented at the 2015 annual meeting of the European Association for the Study of Diabetes (EASD) that shows daytime sleepiness and daytime naps are associated with an increased risk of type 2 diabetes.

Sleep is an important component of healthy living, along with a good diet and adequate physical activity. EDS is widespread around the world, like the habit to take naps during the day, usually they are short, but can range from a few minutes to several hours. Some individuals throw a nap because they are excessively sleepy during the day as a result of a sleep disorder.
In this new study, the authors conducted a meta-analysis to investigate the association between nap or daytime sleepiness and the risk of type 2 diabetes searched Medline (National Library of Medicine of the United States), Cochrane library and web of science for articles published until November 2014 using the keywords daytime sleepiness, napping and diabetes were conducted.

Among 683 studies initially identified to all of them were considered good and included 261 Asian and 365 Western subjects. The studies meet from Sweden, Spain, Finland and Germany (daytime sleepiness) and the United States, China and Germany (nap). EDS is defined as answering yes to questions like: Do you have a problem of daytime sleepiness?

Naps during the day were defined in terms of affirmative answers to questions: such as does a nap during the day? Do you sleep during the day?
That we found excessive daytime sleepiness increases the risk of diabetes by 56% while a longer nap during the day of 60 minutes or more Increased the risk by 46%. In contrast, a short (60 minutes or less a day) did not nap increase the risk of diabetes, avoid nap to 40 minutes a day, a threshold crossed eleven that began to raise the risk significantly.
The authors state: “Excessive take very long naps and daytime sleepiness were associated with an increased risk of type 2 diabetes while a short nap does not increase estate risk.” “The nap during the day might be a consequence of the disturbance of night time sleep as obstructive sleep apnea (OSA).”
Epidemiological studies indicate that obstructive sleep apnea is independently associated with blockages of the heart arteries (ischemia), strokes, fatal and nonfatal cardiovascular events and all-cause mortality.