Sleep position can indeed affect skin aging. Sleeping on your side or stomach can lead to the formation of sleep lines and wrinkles over time due to the compression of the skin against the pillow. Additionally, consistently sleeping on one side can cause uneven skin aging and deepening of wrinkles on that side of the face. To help prevent these effects, sleeping on your back is recommended as it helps minimize contact between your skin and the pillow, reducing the likelihood of developing sleep lines and wrinkles.