That's correct! – at least to a certain extent, because beauty is very individual and it may mean something different for everyone. Nevertheless, sleep patterns can have an impact on one's external appearance.

In a study by Axelsson (2010), healthy adults were photographed at two different times. The first photo was taken after a normal night (8 hours) and the second after sleep deprivation (31 hours awake after a night of reduced sleep). The images were then shown in a random order to independent observers who were asked to rate them. As a result, it was noted that sleep-deprived people appeared less healthy, less attractive, and more tired than when they were well-rested.

In another study, Oyetakin-White (2015) shows the connection between sleep patterns, satisfaction with one's own appearance and skin aging. Chronically poor sleep quality is associated with reduced skin barrier function and lower appearance satisfaction. The term "skin barrier function" refers to the ability of the skin to withstand external influences such as sun, water, soap, chemicals, etc. and the regulation of the water and heat balance.