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+1.

A fun mental exercise is to classify sleep as brain training and then compare the results of sleep to a brain training game (or practically any other activity).

I classify sleep deprivation as brain damage, that way I use fear of becoming stupider to motivate me to stay healthy.

Exactly. If you regularly do this everything falls in place by itself. No need to worry about being productive.

This definitely. A third for me is organizing my tasks into creative/intensive and boring/repetitive. Then I try to pick my tasks according to my energy levels.