Depends on timing, length, and what class I'm flying. My flight this weekend departed just after midnight and was about 7 hours. And I was in business with a lie-flat seat. I put my seat into a bed as soon as I was allowed and basically got up as we started our descent. Not a full/solid sleep, but pretty good. I've taken that route a few times recently and the FA joked that I'm one of the easiest passengers ever - I don't even need a drink.