How to use it
One protected block a day, in your best hours: no messages, no meetings, no feed. The phone goes into another room so it can't interrupt. Write the block into the plan like a session.
How sure we are
P Evidence: promising. Good studies, but small or few. Use it and keep checking.
C Evidence: contested. The research disagrees. Named, so you can stop worrying about it.
Sources
Quiet-time policy raised engineers' productivity (Perlow 1999, one company, 🟡) · notifications alone hurt attention (Stothart et al. 2015, 🟡) · "phone in the room drains you" (Ward et al. 2017) failed to replicate (⚠️).
Not medical, legal or financial advice.