They lock all of your other habits in place.
A person might start exercising once per week, and unknowing begins eating better and being more productive at work. All because she started exercising once per week.
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Your brain is more creative in the morning and more analytical at night.
Use your analytical evening strength to provide a simple plan and starting-point so your creative morning brain can run wild when you first wake up.
It means you are literally unreachable during certain hours.
Don’t check your social media or email until after your 3 hours of deep work. And schedule all of your meetings for the afternoon, after lunch.
Your morning time should be spent on output, not input.
3 pages of longhand writing, strictly stream-of-conscious, done as soon as one wakes.
They are not meant to be art. Or even writing. They need not be smart, or funny, or particularly deep. It's a form of “brain drain”, a way to expel all that angry, petty stuff that spirals through our subconscious and muddies our days.