Notes on focus and deep work

A few loose notes from recent reading on attention and deep work:

1. Attention is a finite, expensive-to-recover resource. Every context switch has a residual cost — the "attention residue" effect, where part of the mind stays on whatever came before.
2. Protected time blocks beat good intentions. Reserving the slot on the calendar works far better than relying on in-the-moment discipline.
3. Low-friction environments for the work that matters. Cutting down the number of small decisions (where to sit, what to open first) frees up attention for what actually counts.

I'm currently testing a fixed 90-minute block in the morning, no notifications. Partial result: a clear improvement in the quality of what I produce in that window, but I still struggle with consistency across the week.