I have high aspirations and expectations for myself. These often create very good opportunities and reinforce my work ethic. But they also have consequences outside of work that I have to pay for. I'm not good at relaxing and I believe I always need to be working on something. Quite frankly, it is a neurosis. Hand-waving comments about "reaching one's potential" as it relates to evolution don't address the topic fully. There needs to be a balance, a time to relax and say, "this is sufficient." The emotional side of your being needs to be allowed the space to breathe.
Perhaps more nuanced thinking on this topic can bring down the level of alpha worship we have in our culture.