[vijucat]

Generally, we do our best to not listen to ourselves. Your mind / body are telling you something when they give up. Instead of being a dictator and trying to trick them further into extracting work, I highly recommend doing WHATEVER pleasant things you feel like, especially of the exercise, hiking, long walk variety! :-) For example, when your kid is out, go for a long walk for an hour in a pleasant park.

More directly, as you forget about the problem and take a walk, something, some spark of insight / revelation comes into the mind by itself because your guard is down and you are not torturing with the usual, "You were SUPPOSED to help me work, but you just want a break, huh?!" self-punishment. This is the realm of the genuine Unknown. Allow it.

Hope this helps.