I too do not take them in Cambodia as not in a malaria area but very close to it One does have to be careful and assess the risk and in particular where there is malaria. I would say though It is not just where you sleep though as in many of the places you might be sitting out over a beer and a meal in the evening
I do take them usually on my African trips as still a lot of malaria there
Hopefully at least we will no longer see posts saying they have never heard of people catching malaria in Cambodia and the like