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John Axelsson from the Karolinska Institute in Sweden and colleagues studied 23 subjects ages 18 to 31. They were photographed between 2 p.m. and 3 p.m. on two occasions -- once after getting a normal night's sleep of eight hours and once after being up for 31 hours after getting only about five hours sleep.
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| after a normal night's sleep (left) and after being sleep deprived (right) |
The photographs were taken in a brightly lit room and the distance to the camera was the same in all the photos. No one wore make-up. Everyone had their hair loose, and were equally well washed and shaved between photos. The researchers asked them to have a relaxed, neutral facial expression for both pictures. Sixty-five observers, who knew nothing about how much sleep each person had gotten, rated the photographs for attractiveness and whether the individuals looked healthy or unhealthy or tired or not tired. The observers judged the faces of sleep-deprived participants as less healthy and less attractive.
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