I noticed a very sad, concerning, and a bit depressing correlation between those of us with bipolar and other mood disorders, insomnia, PTSD, anxiety, and so on - that may wear sunglasses during the day to hide our emotions, tears, or insomniac facial features and skin quality issues and problems, between substance abusers and addicts.

For example, an alcoholic, who likewise hides his or her alcoholism with sunglasses in the night or indoors with sunglasses. It is sad.