How much do we really need to sleep?
Your siblings are alternate versions of what you could have looked like...
really intersting man, good theory
As you grow up, you become more aware of the things around you. It feels like the world is growing alongside you, like a friend that will never leave you until you pass away. But it's always been bigger than you, and will always stay that way. You'll never understand it fully, and you'll never know everything about it. When you think about it, you can realize that it's similar to human relationships. You'll never know someone completely, no matter how long you've spent with that person, as you can't simply visit their head and understand how they think.
There's a lot more to this reflexion, but it would be too long to write. I really explored every nook and cranny of the subject, haha... it got kind of depressing after a few messy thoughts thrown around.