Long naps and daytime sleepiness could increase risk of diabetes
Excessive daytime sleepiness and long naps can signal many things, from working late to sleep disturbance. According to a new study, however, daytime sleepiness and taking long naps may both also be associated with an increased risk of type 2 diabetes. The research is presented at the 51st Annual Meeting of the European Association for the Study of Diabetes, taking place in Stockholm, Sweden. Getting enough sleep is a key part of a healthy lifestyle, playing a crucial role in protecting both physical and mental health. Not getting enough sleep can lead to sleepiness during the day along with napping - the habit of taking short sleeps ranging from a few minutes to a few hours.
According to the National Sleep Foundation, a short nap of 20-30 minutes can help improve mood, alertness and performance. However, napping for longer than 10-20 minutes can lead to sleep inertia - a feeling of disorientation that comes from waking after a deep sleep - as well as potentially having a negative effect on the length and quality of nighttime sleep.
In the new study, Dr. Tomohide Yamada, of the University of Tokyo, Japan, and colleagues set out to examine the association between daytime sleepiness, napping and the risk of type 2 diabetes by conducting a meta-analysis of research published up to November 2014.
Many of the risk factors for type 2 diabetes are linked to lifestyle, including physical inactivity, excess weight and poor diet.
The researchers identified 10 studies that were suitable for the meta-analysis, involving a total of 261,365 subjects. These studies utilized self-reporting to determine daytime sleepiness and napping, with questions such as Do you have a problem with sleepiness during the daytime? to measure the participants sleep habits. Regarding these findings, the authors suggest that mechanisms behind short naps - demonstrated in several studies to have beneficial effects - could explain things, stating that short naps finish before the onset of deep slow-wave sleep: Entering deep slow-wave sleep and then failing to complete the normal sleep cycle can result in a phenomenon known as sleep inertia, in which a person feels groggy, disoriented, and even sleepier than before napping. Although the mechanisms by which a short nap might decrease the risk of diabetes are still unclear, such duration-dependent differences in the effects of sleep might partly explain our findings.
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