1.. I do nothing because I am watching a DVD so it is not an issue.
2.. Not an issue because I can't have a window seat due to being too Sasquatch-like.....I would try not too wake my wife next to me (remember she is disabled so I have to be with her).....If I was petite but still could not get pass I would ask the pax(s) in front of me to please move the seat so I could pass.....If they were asleep same same as they nor I have a choice.
3.. I do not drink alcohol.....My wife brings her own so it would not occur.
4.. See answer 1...