The researchers said it’s the duration of the nap that counts……….Napping for more than 30 minutes at a time can raise the risk of diabetes, according to a new study It can also increase likelihood of high blood pressure and high cholesterol ……………. סיאסטה: ליותר מ -30 דקות בכל פעם יכול להעלות את הסיכון לסוכרת
There is a lot written about sleep and also about siesta-daytime sleep.

In the past I sent  you an article where it was shown that a siesta of longer than half an hour could harm sometimes and a short one was refreshing.I am sending you a few writing about this sleep issue now again.Interesting our Hebrew source!! [Rav Ovadia Yosef writes that this is about half an hour]In short: during a [daytime] siesta try to put your sha-on me-orer [clock]to a bit less than half an hour[if you are still tired then do the same again for another half hour, especially if you are of older age.
ערוך השולחן א, ד

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How a short nap can raise the risk of diabetes: Study finds people who have a siesta are more likely to have high blood pressure and high cholesterol

  • Napping for more than 30 minutes at a time can raise the risk of diabetes, according to a new study
  • It can also increase likelihood of high blood pressure and high cholesterol 

By PAT HAGAN FOR MAILONLINE

PUBLISHED: 00:04 GMT, 21 September 2013 | UPDATED: 09:34 GMT, 21 September 2013

They were much favoured by Margaret Thatcher, Albert Einstein and Winston Churchill.

But while afternoon naps may revitalise tired brains, they can also increase the risk of diabetes, according to new research.

A study of more than 27,000 people in China – where taking a post-lunch snooze is very popular – shows napping for more than 30 minutes at a time can raise the chances of developing type two diabetes.

Researchers found men and women taking 40 winks were also more likely to have high blood pressure and raised cholesterol levels compared to those who stayed awake through the day.

Napping for more than 30 minutes at a time can raise the chances of developing type two diabetes, according to a new study

The findings, published in the journal Sleep Medicine, are in contrast to those from other recent studies, which found daytime sleeps could boost brain power and slash the risk of heart attacks and strokes by more than a third.

The researchers said it’s the duration of the nap that counts. Those dozing for half an hour or more were more likely to have the early signs of diabetes than those who snoozed for less time or not at all.

Read more: http://www.dailymail.co.uk/health/article-2427724/How-short-nap-raise-risk-diabetes-high-blood-pressure-high-cholesterol.html#ixzz3sCR8TzS8
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http://archinte.jamanetwork.com/article.aspx?articleid=485087   Study in Jerusalem [Har ha-Tzofim]
Department of Medicine, Hadassah University Hospital, Mount Scopus