If we plot the brain weight against body weight for primates, the regression line of the sample points can indicate the brain power of a primate species.
Researchers have found that sleeping for an hour in the afternoon boosts brain power and dramatically increases its ability to learn new facts and tasks.
When we are planning for the future and thinking about possible actions to take in the future, we are utilizing considerable amounts of biologically expensive resources (brain power).
It takes a lot of brain power and creativity to memorize, catalogue and maintain the minutia of your experiences to sustain you and make you keep doing what you do.