Long Distance Travel

I don’t get how people sleep on airplanes. I am generally unable to find a comfortable sitting position after 2 hours. I make do though. I then see people around me falling asleep like cats. Any position will do and they all look uncomfortable.

I sam sickened by your ability to sleep. Even in the big comfy chairs. Sitting is not a sleeping position how do you do it? Is it booze or pills? Or are you just freaks of nature who can sleep in a sitting position? Can you sleep standing up as well?