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Are your grandparents up very early in the morning, without fail? Well, it turns out there are scientific reasons why older people wake up earlier as they get older. It’s been revealed that in later life, the natural process of ageing leads to changes in the times the body approaches sleep. According to HuffPost, our approach towards resting and amount of sleep we require is down to both genetics and our age. Cindy Lustig, who is a professor of psychology at the University of Michigan, said: “Like most of the things that change with age, there’s not just one reason, and they are all interconnected.” Sign up to our free Indy100 weekly newsletter It’s all to do with the brain becoming less responsive as people age to factors such as sunlight, social cues and physical activity which indicate where in the day we are at any given time. “The wiring of the brain is likely not sensing... and responding to the inputs as well as it should because it’s an ageing brain,” Dr. Sairam Parthasarathy, the director of the Center for Sleep and Circadian Sciences at the University of Arizona Health Sciences, also told the publication. “These are all what we call time givers, or they give time to the brain,” he said. In other words, they help the brain sense where it is in the 24-hour circadian cycle. Younger people can more easily connect indicators like eating dinner with the idea of sleeping in the next few hours. However, that’s not as easy for older people to register naturally, especially as their vision tends to suffer in later life. “Interestingly, one of [the reasons] seems to be that the vision changes that come with age reduce the intensity of the degree of light stimulation that our brain receives, which plays an important role in ‘setting’ our circadian clock and keeping it on track,” said Lustig. Have your say in our news democracy. Click the upvote icon at the top of the page to help raise this article through the indy100 rankings.

The US could default on its debt as soon as under two weeks from now, and cities with a large military presence risk an economic firestorm if lawmakers don't act.

Ghana’s public debt declined by a quarter at the end of December from the previous month as the

Money managers that trade derivatives linked to oil and fuel prices are about as bearish as they’ve been

The NFL season is still a few months away. Let's take a look at making some bold predictions for each of the league's 32 teams.We've officially hit a lull in the NFL offseason as we are past the NFL Draft and schedule release, leaving us with a roughly two-month dead zone until tr...

Katie Taylor is one of women's boxing's 'Mount Rushmore' figures.

We’re through two rounds at Oak Hill in the PGA Championship, and Scottie Scheffler (-5) is tied for the lead with Corey Conners, and Viktor Hovland with 36 holes to play.The conditions at Oak Hill are supposed to get tougher this weekend, but oddsmakers seem to think they won’t hind...

Italian Premier Giorgia Meloni will leave the Group of Seven summit in Japan a day early to help

Khansa Adam says she wants the government to help get her mother away from the fighting in Khartoum.

The low-slung car shook as I sped down a gravel-strewn rutted trail through the California desert, the sound of its 10-cylinder engine, just behind my head, blasting in my ears. I was driving a $380,000 supercar, the Lamborghini Haracán Sterrato and I couldn't help laughing out loud.

Hall of Fame trainer Bob Baffert will return to this year's Preakness Stakes after serving a lengthy suspension from the sport.