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 probably influences other sorts of evaluations.

“Acute Sleep Loss May Alter the Way We See Others.”  2022.  Press release, Uppsala Universitet, https://www.uu.se/en/press/press-release/?id=5866&typ=pm&lang=en