Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
Too little sleep makes you less attractive
If you get enough sleep you will be more attractive than if you don't get enough. Researchers at the Swedish Karolinska Institutet have proved this once and for all after doing an experiment in which they got young adults to sleep too little one night, followed by a night with no sleep at all.
The researchers had also taken a photo of the 23 subjects when they had had enough sleep. The panel were shown these as well, making a total of 46 photos for them to look at.
The panel had to give the people in the photos a score between 0 and 10 for attractiveness, tiredness and health.
The judgements that the researchers measured influence each other. The healthier someone looked, the more attractive they were also perceived to be. Appearing to have had enough sleep weighed less heavily as a factor.
The researchers think that preference for a well-rested face is a result of the evolutionary process. People who sleep well are healthier, and their children are therefore likely to be stronger.