Sleeping in on weekends may prevent obesity

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Catching up on lost sleep over weekends may help people keep their weight down, according to a study in South Korea.

Not getting enough sleep can disrupt hormones and metabolism and is known to increase the risk of obesity, researchers write in the journal Sleep.

"Short sleep, usually causing sleep debt, is common and inevitable in many cases, and is a risk factor for obesity, hypertension, coronary heart disease, as well as mortality," lead author Dr. Chang-Ho Yun of the Seoul National University Budang Hospital told Reuters Health by email.

Sleeping in may be better than napping, as the sleep may be deeper and follows the body's sleep-wake rhythms more closely, Yun said.

To determine how weekend sleep is related to body weight, the researchers used data from a nationwide survey of more than 2,000 people who ranged in age from 19 to 82 years old.

In face-to-face interviews, researchers asked participants about their height and weight, weekday and weekend sleep habits, mood and medical conditions.

The study team used this information to determine body mass index (BMI), a measure of weight relative to height, and whether participants engaged in catch-up sleep on weekends.

Weekend catch-up sleep was defined as sleeping more hours on weekend nights compared to weekday nights.

On average, the participants slept 7.3 hours per night and had BMIs of 23, which falls in the healthy range.

About 43 per cent of people slept longer on weekends by nearly two hours than they did on weekdays.

8 ways sleep can solve your problems

  • If you often suffer from monthly period cramps, try to clock in more Zs. In a study done in Georgia, it was found that a lack of sleep made period cramps worse, as less serotonin is produced when we don't sleep enough, resulting to a lower threshold for pain.
  • Here's something we can't complain about. Sleeping more can indeed help you burn calories. So don't put in hours in the gym, but hit the sack an hour or two earlier for the sake of your waistline!
  • A lack of sleep causes the emotion centre of the brain, known as the amygdala to become more sensitive, hence sleep-deprived people often react more negatively to situations.
  • Your best self will definitely arise from a well-rested you. When we are sleep-deprived, we lose focus, attention and vigilance.
  • Even with excessive amounts of vitamins, you are still likely to fall sick if you're not sleeping enough. Our bodies stop reacting to vaccinations when we suffer from a lack of sleep, similar to how we always sleep to feel better after our medication when we're feeling under the weather.
  • Beauty sleep is indeed a real thing. When we are sleep deprived, our skin will suffer from inflammation and dehydration. Increased stress hormones can also arise which worsens any inflammatory skin conditions like acne.
  • Try getting a full night's sleep and you might see a difference to how you approach the everyday stressors in your life. Even with the world weighing down on your shoulders, a well rested night could definitely make anything better.
  • When we're running on minimal sleep, anything can seem more risky and daunting to attempt. With more sleep hours clocked in, you could be more willing to try out adventurous things in your life, be it in your work or downtime.

People who slept-in on weekends tended to sleep shorter hours during weekdays, but slept more hours overall across the week.

The researchers' analysis found that those who slept-in on weekends had average BMIs of 22.8 while those who didn't engage in catch-up sleep averaged 23.1, which was a small but statistically meaningful difference.

In addition, the more catch up sleep a person got, the lower their BMI tended to be, with each additional hour linked to a 0.12 decrease in BMI.

"Short sleepers tend to eat more meals per day, snack more, engage in more screen time and may be less likely to move due to increased sensations of fatigue when not rested," said Jean-Philippe Chaput of the University of Ottawa in Canada, who wasn't involved in the study.

Chaput noted that getting 30 minutes of heart-pumping exercise per day can help improve sleep.

"Sleep experts say that if people need an alarm clock to wake up it is a sign that they don't sleep enough," Chaput said by email.

"The more good behaviours we can have every day (and sustain for the rest of our lives) the better it is for the prevention of chronic diseases and optimizing health. Sleep should be one of these priorities," he said.

"If you cannot sleep sufficiently on workdays because of work or social obligations, try to sleep as much as possible on the weekend. It might alleviate the risk for obesity."

"Weekend sleep extension could be a quick fix to compensate sleep loss over the week but is not an ultimate solution for chronic sleep loss," Yun cautioned.

"If average sleep duration over the week is far below the optimal amount even with weekend sleep extension, the benefits would likely dissipate," Yun said.

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