A recent study has found that beauty sleep is no myth, according to The Independent. And that's not all. The following week, the volunteers photographed themselves after having two consecutive nights with only four hours of sleep.
Next, they asked 122 participants to look at photos of the participants and rate them in terms of attractiveness, health, sleepiness and trustworthiness.
The volunteers were perceived to be less healthy-looking, less sociable and less intelligent after half the amount of sleep.
The researchers reckon that our exhausted faces make people think we're less healthy.
"Recent findings show that acute sleep deprivation and looking exhausted are related to decreased attractiveness and health, as perceived by others", they add.
Member of this group, referred to as "subjects" in the paper, had their photo taken twice - once after two consecutive nights of normal sleep (about 7.5 hours) and again after two consecutive nights of poor sleep (about 4.25 hours).
Beauty sleep is a real thing, according to researchers who have shown that people who miss out on sleep do appear less attractive to others.
They also were asked how much they would like to socialize with the person in the photo. We really should be getting more sleep.
The study discovered that people started to look more exhausted and unhealthy when their sleep was halved for just two nights.
Findings published on Wednesday indicated people are less likely to avoid eye contact with those who show signs of sleep deprivation. The data also demonstrated that they were also less willing to socialise with those who had not slept well.
Dr Gayle Brewer, a psychology expert at the University of Liverpool and member of the British Psychological Association, said: 'Judgement of attractiveness is often unconscious, but we all do it, and we are able to pick up on even small cues like whether someone looks exhausted or unhealthy'.
While further studies are needed to gain a better understanding of the mechanisms underlying the effects of sleep deprivation on facial appearance, the researchers believe that their findings further highlight the importance of a good night's sleep.
"We want our partners to be attractive and energetic", he added.