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Seasonal affective disorder (SAD) is a type of depression that occurs at a certain time of year, usually in the fall or winter.

It is not clear what causes SAD, but it is thought to be related to the change in daylight hours and the decrease in sunlight exposure; which can disrupt the body's circadian rhythm and lead to fatigue, difficulty concentrating, changes in appetite, and feelings of hopelessness and despair.

Moral amnesia is a cognitive bias that causes people to forget the bad things they've done and only remember the good. This bias can lead to unethical decisions because people forget the negative consequences of their actions. Moral amnesia is a problem because it causes people to rationalize their unethical behavior.