Agree on the Bose models. I think the QC35s are the most comfortable over-ear headphones I've ever used. Not that older models were bad, but they would get uncomfortable after 8-10 hours.
The in-ear Q20s are actually what I usually carry when flying long haul, especially in biz/first class. I sleep best on my sides, so rolling over from my back to my side can't really happen with over-ear headphones, but I can get comfortable with the QC20s.