Why it matters
Focused work on hard problems is where real progress tends to happen, yet most days fill up with messages and meetings. A deep work habit makes focus something you plan, not something you hope for.
Research on attention suggests that switching between tasks has a cost, and it can take time to get back into focus after an interruption. A dedicated block with notifications off reduces those switches.
Deep work is a skill that grows with practice. Start with a length you can actually protect, and build up gradually.