It is quite normal to feel disgusting after a night of turning around or getting up too late. But new research suggests that there may be more than just sleep deprivation: you can even be dehydrated, researchers say, and drinking more water can make you feel better.
The study, published this week in the journal Sleep found that people who reported to sleep regularly only six hours a night had 16-59% more likely to be "inadequately hydrated" (based on analysis of their urine samples) compared to those who claimed to sleep normally eight. Both the US and Chinese adults participated in the research ̵
This does not mean that people who sleep less drink less; in fact, the study authors actually controlled total fluid consumption among some of the participants. They found that even when people reported drinking the same amount, those who slept less were more likely to have more concentrated urine and other signs of dehydration.
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So what's going on? The authors of the study state that it probably has to do with a hormone called vasopressin, which helps regulate the state of hydration of the body.
Vasopressin is released both day and night, but production increases much later in the sleep cycle, said lead author Asher Rosinger, assistant professor of bio-behavior and anthropology at Penn State University, in a press release. "So if you wake up early, you might lose that window where more hormone is released, causing an interruption in the body's hydration," he added.
The authors point out that poor sleep has been associated in previous studies with chronic kidney disease, and they say that dehydration can be a significant driver of that link. Long-term dehydration can also increase a person's risk of kidney stones and urinary tract infections.
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Because the study was based on reported sleep data and only examined the results of the urine at a given time, it was only able to find a & # 39; association between the two, not a cause-effect relationship. Future studies should look at this report over the course of a week, the authors wrote in their article, to understand how the hydration and sleep state of people change daily.
The National Sleep Foundation suggests that adults should have seven to nine hours of sleep a night and that it is better to keep the bedtime and alarm time as consistent as possible. (In this study, sleeping more than nine hours a night did not seem to have any effect, in either direction, on the state of hydration.)
Of course, you do not really need of another reason why skimping on sleep hurts you: it is also linked to a higher risk of cardiovascular disease, overeating, weight gain (even when it is not related to overeating) and diabetes, to name a few. It can also cause short-term problems such as irritability, difficulty concentrating, memory problems and sleepy driving.
But dehydration itself has also been shown to cause headaches and fatigue and to influence mood, cognition and physical performance, which can add to the already negative effects of a sleepless night, the authors say. "This study suggests that if you do not sleep enough and you feel sick or tired the next day, drink extra water," said Rosinger.
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