Hmm. You know, what I also do is wait until the power goes out, giving me an excuse not to be on the computer. Then I draw a very crude scetch of the level I was planning on making, along with a printout of the tileset to see if it is plausible. This usually works until the candle burns my work/fingers/house.

You could also try the same strategy in the bathroom. Just hide whatever you were doing in the newspaper that's mysteriously there.