A new study finds that lack of sleep makes people less attractive.
They recruited 25 volunteers who had their photo taken twice - once after two consecutive nights of normal sleep (about seven and a half hours) and again after two consecutive nights of poor sleep (about four hours and 15 minutes).
Respondents, who were "less inclined to socialize with individuals who had gotten insufficient sleep", even rated the sleep-deprived students less healthy than their well-slept counterparts.
"An unhealthy-looking face, whether due to sleep deprivation or otherwise, might activate disease-avoiding mechanisms in others", said Axelsson. Attractiveness, health, sleepiness and trustworthiness were also rated. Researchers also asked, "How much would you like to socialize with this person in the picture?"
"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", she added.
That's potentially a problem for a lot of people: According to the National Sleep Foundation, adults over the age of 18 need a minimum of seven hours of sleep a night - and many don't get that.
"Sleep deprivation is associated with a wide variety of physiological changes, such as impaired immune function, reduced cardiovascular health, and even impaired glucose metabolism", she says, which is why people who are sleep deprived can be viewed as less healthy. The adults were asked to rate how attractive, healthy, or trustworthy they perceived the person in each photograph to be, as well as whether they would like to socialize with that person. However, Dr Sundelin also pointed out, "I don't want to worry people or make them lose sleep over these findings though".
Not getting enough sleep may crimp your social life as well as take a toll on your looks, according to a new study from Sweden.
A person's attractiveness score generally suffered when they were looking exhausted.
As a result, they were less attractive to potential partners and less likely to be chosen by friends and colleagues to socialise with. When asked the latter question, the participants said they were less willing to hang out with the sleepy looking photographs.
However, statistics show that around 1 in 3 adults in the United States fail to get the recommended minimum of 7 hours of sleep each night.