Why do many ordinary people feel tired even though they haven't done anything?

Many people think that work consumes the most energy, but what truly depletes cognitive resources is often continuous decision-making.
From choosing what to eat, what to wear, to repeatedly comparing parameters, prices, and brands while shopping, every small decision occupies brain bandwidth.
Especially when tired, people mistakenly believe that scrolling through shopping apps is resting, but in fact, they are still making high-intensity decisions.
Therefore, for trivial matters where the cost is manageable, the best strategy is often not to pursue the optimal solution but to reduce choices by standardizing diet, clothing, and daily routines to save cognitive resources.
Because what people truly lack is not time, but decision-making ability.
Only by standardizing trivial matters and freeing limited energy from meaningless choices can one have enough cognitive bandwidth to make more rational judgments when facing complex issues like entrepreneurship, career development, and life direction.