I think it's about being confused and also depressed. And not just any confusion or depression but the one that people get as soon as fall/winter starts.
People tend to think things over and are more likely to be frustrated/depressed when it's all grey and cold outside. When you're depressed like that it may appear to you that you're the only living individual on earth who feels like that, who does not know where to go etc. That's why he's saying "I always wonder how they know where to fly".
I think it's about being confused and also depressed. And not just any confusion or depression but the one that people get as soon as fall/winter starts.
People tend to think things over and are more likely to be frustrated/depressed when it's all grey and cold outside. When you're depressed like that it may appear to you that you're the only living individual on earth who feels like that, who does not know where to go etc. That's why he's saying "I always wonder how they know where to fly".
I love that song by the way. :)