Sleep­ing over 8 hours a night may be harm­ful

The Borneo Post - Nature and health - - Front Page -

NEW RE­SEARCH has found that sleep­ing longer than the rec­om­mended amount could be bad for your health. More than eight hours of shut-eye is as­so­ci­ated with an in­creased risk of car­dio­vas­cu­lar dis­ease and death, com­pared to sleep­ing less than seven hours.

Led by re­searchers from Keele Univer­sity, along with col­leagues at the Univer­sity of Manch­ester, the Univer­sity of Leeds and the Univer­sity of East Anglia, the new anal­y­sis looked at 74 stud­ies which in­ves­ti­gated the link be­tween sleep du­ra­tion and sleep qual­ity and the risk of mor­tal­ity and car­dio­vas­cu­lar dis­ease.

To­gether, the stud­ies in­cluded 3,340, 684 par­tic­i­pants who self-re­ported their sleep du­ra­tion. The re­searchers found that par­tic­i­pants who re­ported sleep­ing for more than eight hours a night had a greater mor­tal­ity and car­dio­vas­cu­lar risk than those who slept for less than seven hours.

A sleep du­ra­tion of ten hours a night was linked with a 30 per cent in­creased risk of dy­ing com­pared to sleep­ing for seven hours, a 56 per cent in­creased risk of dy­ing from a stroke and a 49 per cent in­creased risk of dy­ing from car­dio­vas­cu­lar dis­ease. In ad­di­tion, poorqual­ity sleep was as­so­ci­ated with a 44 per cent in­crease in coro­nary heart dis­ease.

Lead re­searcher Dr Chun Shing Kwok said, “Sleep af­fects ev­ery­one. The amount and qual­ity of our sleep is com­plex. There are cul­tural, so­cial, psy­cho­log­i­cal, be­havioural, patho­phys­i­o­log­i­cal and en­vi­ron­men­tal in­flu­ences on our sleep such as the need to care for chil­dren or fam­ily mem­bers, ir­reg­u­lar work­ing shift pat­terns, phys­i­cal or men­tal ill­ness, and the 24-hour avail­abil­ity of com­modi­ties in mod­ern so­ci­ety.”

“This re­search be­gan be­cause we were in­ter­ested to know if it was more harm­ful to sleep be­low or be­yond the rec­om­mended sleep du­ra­tion of seven to eight hours. We fur­ther wanted to know how in­cre­men­tal de­vi­a­tion from rec­om­mended sleep du­ra­tion al­tered risk of mor­tal­ity and car­dio­vas­cu­lar risk.” “Our study has an im­por­tant pub­lic health im­pact in that it shows that ex­ces­sive sleep is a marker of el­e­vated car­dio­vas­cu­lar risk.”

“Our find­ings have im­por­tant im­pli­ca­tions as clin­i­cians should have greater con­sid­er­a­tion for ex­plor­ing sleep du­ra­tion and qual­ity dur­ing con­sul­ta­tions. If ex­ces­sive sleep pat­terns are found, par­tic­u­larly pro­longed du­ra­tions of eight hours or more, then clin­i­cians should con­sider screen­ing for ad­verse car­dio­vas­cu­lar risk fac­tors and ob­struc­tive sleep aponea, which is a se­ri­ous sleep dis­or­der that oc­curs when a per­son’s breath­ing is in­ter­rupted dur­ing sleep.” The re­sults were pub­lished in the Jour­nal of the Amer­i­can Heart As­so­ci­a­tion. – Re­laxnews

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