Three variations on 'leave something unfinished today, so that you may work easy tomorrow': commoncog.com/blog/exploitin
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A small update to this: I went back to Wai Chuan, and he said that the second part of his technique is that his first task must be done before lunch.
If it's not done, no lunch!
It forces him to pick a first task very carefully + finishing it to build momentum for the rest.