I'm in the final year of my PhD, but yes I agree I should probably look into better ways of handling work. I'm thinking of changing things after finishing, this is not a good way to live life.
Oh, a PhD... well that's different, yes, a grad student always feels like they should be working on their thesis. I've done this, and regret not taking a month off once for a trip. I wouldn't have had a hard time with it once I was actually on the trip, but I couldn't justify taking it in the first place. Productivity-wise probably would have been close to a wash.
