These changes alter our perception of attractiveness, intelligence and health, according to the study, suggesting beauty sleep could be a real thing.
Neuroscientist Dr Tina Sundelin, of the Karolinska Institute, Stockholm, where the research was carried out, explained: "The results show that (people) were less inclined to socialise with individuals who had gotten insufficient sleep".
25 Swedish students were studied upon which included 14 women, 11 men- aged 18 to 47 years old, who had their pictures clicked after two consecutive nights of poor quality sleep, just 4.25 hours and also after when they had a proper sleep of about 7.5 hours.
The researchers then showed these photos to 122 strangers and asked them to rate the people in the photos in terms of attractiveness, sleepiness, trustworthiness, health, and how approachable they were.
In addition, they also deemed the poorly rested subjects to be less attractive, less healthy and more sleepy compared to when they were well rested.
'An unhealthy-looking face, whether due to sleep deprivation or otherwise, might activate disease-avoiding mechanisms in others, ' say the researchers. People were rated by strangers as less healthy and approachable when they had exhausted faces. Two subjects were even rated as more attractive in their sleep-restricted photos. They also asked them, 'How much would you like to socialise with this person in the picture?'
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Furthermore, the study found that people's willingness to socialize with sleep-deprived people was only 2.1 percent less than their willingness to do so with fully rested people.
"I don't want to worry people or make them lose sleep over these findings though".
The strangers were very capable of telling when the people in the photos were exhausted. These are small tweaks, but they can help you nab more sleep and change how the world perceives you.
Nevertheless, it might be a good idea to try and get the recommended eight hours of sleep whenever possible. "We want our partners to be attractive and energetic".
Still, the findings are interesting - if only as a reminder of the many ways that not getting enough sleep can negatively affect your wellbeing, including, apparently, your social wellbeing.