These changes alter our perception of attractiveness, intelligence and health, according to the study, suggesting beauty sleep could be a real thing.
According to researchers from Karolinska Institutet in Sweden and New York University in the United States said,"People seem to be able to tell when someone needs more sleep, and are more inclined to leave them alone in that case".
The research involved 25 volunteers who agreed to be photographed after having had two consecutive nights of good sleep, and then again after having had only four hours sleep for two nights in a row.
The study's volunteers also indicated they were less willing to socialize with people who were sleep deprived - by an average of 0.15 points. However, researchers tell people they shouldn't worry too much about this. These images were presented to 122 strangers living in Stockholm, who were asked to rate the photographs based on health, attractiveness and trustworthiness. But there were small differences in the ratings depending on whether the photo showed a person rested or sleep deprived. Two subjects were even rated as more attractive in their sleep-restricted photos. "If you can see someone hasn't slept, you'll have a good idea that they might not be the best person to be around". The study also found that it makes people less keen to hang out with you.
"Findings show that acute sleep deprivation and looking exhausted are related to decreased attractiveness and health, as perceived by others", the study authors conclude.
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"People seem to be able to tell when someone needs more sleep, and are more inclined to leave them alone in that case", the authors wrote in the new work.
"We want our partners to be attractive and energetic", he added.
"If someone looks exhausted, they look less interested in being with you and as if they would rather be asleep or alone", he said.
You already know that a good night's sleep and weight loss have a strong correlation, but now studies officially show that there's a connection between shut-eye and perceived attractiveness. If you're struggling to get enough sleep, she recommends stopping work on your phone or computer an hour before bed, keeping your bedroom just for sleeping, and trying to have regular sleep hours.