Night time escapades

Why is night, the time when one must rejuvenate and get some sleep, the easiest time to sit up for hours and just think? And I mean think. Hard. About things that could be qualified as random or nonsensical. I constantly fall victim to my brains mysterious powers of moving about wildly at night. And it really only happens when I'm alone, lying in my bed, harmlessly. Stupid brain. No pun intended. Also, I watched "When Harry met Sally" tonight. It was excellent; a really accurate description of what I think intimate relationships should be based off of. Friendship :)