I like to sit by a window so I can keep my body clock to natural time - if it's light outside I stay awake, if it's dark I try to sleep. I've had several "discussions" with cabin staff asking me to shut the blind when it's a beautiful view below in the middle of the day, but they want passengers to sleep.
My system seems to work when I'm allowed to do it, it just means either a short day or a long day depending on which way you're going.