Sleep at 10pm linked to lower heart risk: Study
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MONDAY, JANUARY 30, 2023
Sleep at 10pm linked to lower heart risk: Study

Health

TBS Report
09 November, 2021, 10:15 am
Last modified: 09 November, 2021, 10:15 am

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Sleep at 10pm linked to lower heart risk: Study

TBS Report
09 November, 2021, 10:15 am
Last modified: 09 November, 2021, 10:15 am
Representational image. Photo: Healthy Burnett.
Representational image. Photo: Healthy Burnett.

A new study has found that falling asleep between 10pm and 11pm could result in a lower risk of developing heart disease.

The study, based on data from more than 88,000 participants of the UK Biobank, found compared to falling asleep between 10pm and 10.59pm there was a 12% greater risk for 11pm to 11.59 pm, and a 24% increased risk for falling asleep before 10pm.

Meanwhile, there was a 25% higher risk of cardiovascular disease associated with falling asleep at midnight or later, reports Guardian.

The study cannot prove that early or late bedtimes contribute to the development of cardiovascular disease – not least since when people fall asleep may be linked to other health conditions or behaviours, such as staying out late and drinking, that may be linked to cardiovascular disease risk.

Moreover, the study did not look closely at the quality of the participants' sleep, only length and timing.

Dr David Plans, the head of research at Huma Therapeutics and senior lecturer at the University of Exeter, who co-authored the study, said one possibility was that early or late bedtimes might result in individuals missing important cues such as morning daylight, which help to reset the body's internal clock each day.

If the body clock is not reset properly over a long period, "that misalignment of behaviours and the circadian clock increases inflammation and can impair glucose regulation, both of which can increase risk of cardiovascular disease", Plans said.

Writing in the journal European Heart Journal – Digital Health, Plans and colleagues report that 3,172 of the 88,026 participants, recruited between 2006 and 2010, developed cardiovascular disease over an average follow-up time of 5.7 years, none of whom had the condition, or a sleep disorder, at the start of the study.

The team then drew on data from wrist-based devices worn by participants for seven days to explore whether there was an association with the time that participants fell asleep at night.

The team found that of the 3,172 participants, 1,371 fell asleep after midnight on average over the seven days of device wearing, 1,196 nodded off in the hour from 11 pm, and 473 fell asleep in the hour from 10 pm. Only 132 dozed off before 10 pm.

After taking into account various information, such as participants' age, sex, smoking status, duration of sleep, sleep irregularity, whether they had diabetes, their blood pressure and socioeconomic status, the researchers found participants who fell asleep between 10 pm and 10:59 pm had a lower risk of cardiovascular disease than those who dozed off earlier or later.

 "Because we also adjusted for all of the other more common cardiovascular risk factors, it's clear that this association is significant in some way," said Plans.

The team say the findings appear to be stronger in women than men, although the reasons for this remain unclear.

The study has limitations, including that it is based only on data from adults aged 43 to 79, and participants of the UK Biobank – a database of genetic and lifestyle information that researchers are using to investigate myriad health issues – are predominantly white.

Plans said further research, with larger numbers of participants, is needed to examine the findings, adding there was not enough evidence at present to prescribe a particular bedtime to the public.

However, he said the study added support to the importance of sleep hygiene – habits that help with a good night's rest.

"People often assume that cardiovascular disease is a consequence of physiological influences," Plans said. "Whereas actually, the behavioural influence on the cardiovascular system as a result of circadian disruption is enormous."

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