I am in similar situation. Routine can help in some cases. When you have a routine your wife and kids know when you will leave the room and when you will go back in (or the cave as my wife calls it :D). Sometimes it can be hard to take breaks at the same time everyday, especially when you are trying to figure out a problem you believe you are very close to solving. However, sometimes that break is all you need to fix that pesky bug!
Headphones are also helpful, though like you I am a night owl as well. The only problem with that is that it can lead to irregular sleep, a subject a would like to read more about from a programmer who works at home with a family.
I am glad you watched a documentary and felt as if you now have a good understanding as to what is happening in Venezuela . Just like right-wing people get their news from conservative, mainstream media, there are those who try to justify their inner ideologies and believes by thinking that the information they get from an old-fashion group of leftys is just, fair and even objective.