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Welcome to the World news. World news keeps you updated news around the nations.

Today's topic is "Study: Irregular Sleep Increases Risk of Heart Disease"

A new study has found that not having a regular time to sleep and wake up can be bad for your heart. Having regular sleep was defined by the study as always going to bed and waking up within 30 minutes of the same times.

The study looked at almost 2,000 people between the ages of 45 and 84 for five years. Their health and living habits were checked, and they were asked to wear a device on their wrist for seven nights that measured when they slept.

The study's lead author, Tianyi Huang, from Harvard Medical School, said that those with the most irregular sleep times – more than a 90 minute difference on average over seven nights – were more than two times as likely to have heart disease over 5 years.

The study found that even after considering other things that can cause heart disease, like cholesterol, blood pressure and the quality of the person's sleep, having irregular sleep times still had an effect. Huang told CNN that this means irregular sleep should be considered a health risk.

About a quarter of those in the study had significantly irregular sleep times, which the researchers found surprising, since many were retired. Huang said that even more young people might have irregular sleep, since they are more likely to change their sleep times because of study and work.

If people get into the habit of irregular sleep when they are young, it could become dangerous. "The more you sleep irregularly, the higher the risk you have," Huang said.

America's National Sleep Foundation recommends sticking to your sleep schedule every day, and sleeping in for no more than one or two extra hours on weekends. You should also try to turn off bright lights late at night so you don't feel like staying awake, and let yourself see the sun in the morning so it's easier to get up. You should also avoid hitting the snooze button.

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Study: Irregular Sleep Increases Risk of Heart Disease