Your mind is a bad hard drive for open commitments

Allen's starting observation is that the brain is excellent at association and creative thinking but terrible at reliably storing to-dos, reminders, and unfinished commitments. Any time you try to hold something "in mind" until later, part of your attention keeps quietly re-checking it, like a background process draining battery — even when you're doing something unrelated.

He calls these unresolved items open loops: the birthday gift you haven't bought, the email you meant to answer, the vague sense there's something you're forgetting. The stress most people attribute to having "too much to do" is often really the stress of having too many things being tracked nowhere but memory.

The fix isn't trying harder to remember — it's building an external system trustworthy enough that your brain stops trying to do the job itself. Only then can attention fully land on the present task.

Takeaway: any commitment left only in your head is a small, constant drain on your focus — get it out and onto paper or screen.