“What I know is that everyone’s anxiety is universal but also very unique to them,” Debra Kissen, PhD, psychologist and CEO of the Light On Anxiety CBT Treatment Center in Chicago, tells SELF. As you might expect, people who are naturally more anxious or have been diagnosed with an anxiety disorder may be more likely to feel uneasy at sunset. If the mantra behind your sunset anxiety is “I didn’t do enough,” or it resembles Sunday scaries, productivity guilt could be to blame.