Going to bed at 11pm reduces the risk of high blood pressure and keeps the heart healthy - especially in men, scientists say. But for women, the perfect time to sleep is midnight.
Researchers who analyzed more than 14,000 men and women found that those who adhered to these hours of sleep most nights of the week had the lowest odds of heart problems.
But going to bed earlier or later increased the chances of developing high blood pressure, also called hypertension, as it could mean people were getting too much or too little sleep — both of which are associated with higher readings.
About one in five adults in Europe suffers from high blood pressure. It is the leading cause of heart attacks and strokes.
Blood pressure, which describes the force with which your blood pushes against the sides of your arteries as it is pumped around your body, is measured in millimeters of mercury - or mmHg.
A high reading is classified as anything above 140/90 mmHg.
Smoking, obesity and a poor lifestyle can increase the risks, but studies show that irregular sleep patterns are also a factor.
Previous studies have found that getting seven to nine hours of sleep a night protects against high blood pressure.
Researchers at South China University in Hengyang tracked 14,536 adults of all ages to see how their sleep habits affected their heart health.
The results, published in the journal Postgraduate Medicine, showed that men who usually went to bed at 11pm were 32 per cent less likely to develop high blood pressure than others who went to bed earlier or later. late.
For women, the healthiest bedtime was midnight.
In a report on their findings, the researchers said: “The risk of high blood pressure decreased gradually with sleep delay.
"But the effect seems to differ significantly between the sexes."
"For men, the time point of lowest risk was 11:00 p.m., but for women it was midnight."
They added that sleeping at other times can disrupt the body's internal clock, which can cause blood pressure to rise.
It can also reflect high levels of mental stress, which can also increase heart risk.