Thanks for the post. You make a valid point on the topic of sublimation, but what I described wouldn't be considered such (in my perspective). Sublimation, as you stated, and as stated by encarta is:
1. redirecting of unacceptable impulses: the channeling of impulses or energies regarded as unacceptable, especially sexual desires, toward activities regarded as more socially acceptable, often creative activities
If you have a problem in life and choose to avoid it by keeping your mind busy with something else, then that could be considered sublimation. I am referring to the exhausted mind (brain) which has been thinking about the same thing(s) for too long, and it is time to give it a rest from everything and allow it to recover. A good sound sleep is an option, but the problem is when you are very busy, with a project from work or schoo for example, you tend to go to bed thinking about it, specially with projects that will last a few weeks. Thinking about the problem all day long will not help solving it faster; on the contrary, it will lock your mind and you may find yourself at a dead end where no more ideas will flow. The best way to deal with it is to take a step back and return to it with a fresher mind.
At work, I've encountered complex logical problems which put me in a brain lock mode. To find a solution, I step back and walk away from it, normally by taking a walk and forgetting about it. Once I come back, I start at a few step back and work my way through again. This has helped me. The same concept can be applied with instruments. Take 20 to 30 mins a day to play an instrument or simply chill listening to some good metal music while you forget about everything else. It allows your mind to rest and you are ready for another day.