By Steven Reinberg
THURSDAY, Sept. 5 (HealthDay News) -- Every face tells a story, and when you've had too little sleep the world sees it in technicolor, a new study suggests. What's more, those red, puffy eyes and sagging eyelids likely influence what people think of you, the researchers say.
So, the next time you're tempted to pull an all-nighter, consider that "other people might treat you differently because of the way you look when you haven't slept," said lead study author Tina Sundelin, from the department of psychology at Stockholm University.
A plastic surgeon who was not involved in the study agreed that these attributes may speak volumes to others. "We all make unconscious and conscious value judgments of people based on appearance: character, trust, strength, attractiveness, etcetera. Some of this is undoubtedly genetic and some of this is prejudice," said Dr. Jeffrey Salomon, an assistant clinical professor of plastic surgery at Yale University School of Medicine.
Lack of sleep is easily recognizable because everyone has experienced it, he explained. "Character judgments and scenarios associated with this observation are inevitable," Salomon said. "The 'lookness' of people elicits a strong mental and visceral response in the observer, even if the observer is you looking in the mirror or at a photograph."
The only way to improve the look of fatigue is to sleep, Salomon added.
For the report, published in the September issue of Sleep, Sundelin's team took photos of 10 people after eight hours of sleep and again after 31 hours of not sleeping. The researchers then showed the photos to 40 people who evaluated them based on 10 facial cues, and fatigue and sadness.
Sleep deprivation was linked to looking significantly more fatigued, the investigators found.
According to the researchers, reading facial cues is a highly developed skill. Based on this skill, people make judgments about whether someone can be trusted or is aggressive or competent, they pointed out.