How sleep or lack of, affects our perception of people.

Investigators lead by van Egmond report (in a study published in Nature and Science of Sleep) that “young adults when sleep-deprived evaluate angry faces as less trustworthy and healthy-looking. Furthermore, neutral and fearful faces appear less attractive following sleep loss. . . . The participants spent one night with no sleep at all and one night with an eight-hour sleep opportunity. [Data were collected] in the mornings following both nights.” It seems likely that whether one has slept or not…

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