Bright light therapy can help ease SAD, major depression, and perinatal depression. October 28, 2022By Julie Corliss, Executive Editor, Harvard Heart Letter The transition from fall to winter means grayer skies, shorter days, and for some people, the return of seasonal affective disorder. With the apropos acronym of SAD, this disorder has symptoms similar to depression (such as feeling sad, listless, and sluggish) but occurs...