When I first started flying F regularly, I built a theory after a few trips that the crew seemed very attentive with alcohol top-ups around meal service and then turned the temperature up, hoping you go to (and stay) asleep.
This isn't always the case, but it has been more often that not, especially on BA.
We are human, so I'd guess if you are working a long-haul, you would just want to get the service finished, have a sit down and chat with your colleagues, hoping not to be disturbed too often.
Nowadays, I ask for the temperature to be turned down.