As somebody that lives somewhere where SAD is a real thing, I can perhaps offer a glimpse into this. During the winter, it's so dark and cold, you get depressed

As somebody that lives somewhere where SAD is a real thing, I can perhaps offer a glimpse into this. During the winter, it's so dark and cold, you get depressed. You stop going out, and you stop socializing. It's not that bad, at least you don't feel so worthless for not going outside since everything is awful outside. Then spring comes along and everyone starts going outside. The weather is very good now. Everyone is having fun. Everyone but you. You are still stuck inside, afraid to come out, all depressed. That's the point where suicide start to seem like an option.