An inter­na­tion­al group of car­di­ol­o­gists from the UK and the US pub­lished the results of a study accord­ing to which both lack of sleep and too much sleep increase the like­li­hood of devel­op­ing a stroke or heart attack.

Sci­en­tists came to these con­clu­sions by ana­lyz­ing med­ical data and sleep diaries over 7 years of obser­va­tion of more than 460,000 peo­ple aged 40 to 69 years. The records were pro­vid­ed by the British Biobank. In their cal­cu­la­tions, sci­en­tists took into account more than 30 fac­tors that affect heart health and human sleep.

It turned out that those who slept less than 6 hours a day, the like­li­hood of devel­op­ing a first heart attack in their lives was 20% high­er than those who slept the pre­scribed 6–9 hours. But for those who slept more than this norm, the risks were even high­er — by 34%.

The risks increased as peo­ple devi­at­ed from the norm at 6–9 hours. So, those who slept for 5 hours, the risk of a heart attack increased by 52% com­pared to those who slept the ide­al 7–8 hours. And those who slept 10 hours a night dou­bled their risks.

More­over, if a per­son, accord­ing to their genet­ic char­ac­ter­is­tics, was ini­tial­ly at an increased risk of devel­op­ing heart dis­ease, then a nor­mal sleep dura­tion reduced the risk of a first heart attack by 18%.

Accord­ing to sci­en­tists, the find­ings pro­vide strong evi­dence that the dura­tion of sleep is one of the key fac­tors affect­ing heart health.

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By Yraa

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