Why Am I UP?

It is almost 1 a.m.  Why am I up?  I should be sleeping peacefully in my bed having been there for several hours now.  I always find myself back here.  Tired, but awake way past the time I should be.  I used to think when I grew up I would not be a night owl.  I would go to bed at a decent hour and get at least 8 hours and get up early to get things done.  Maybe I haven't grown up yet.  :)