I follow the Steven Pressfield model: The Muse of Routine. Mornings are always for analysis - I am always listening to mixdowns, deciding on arrangements, listening to interviews, and reading manuals. The day is for work and life - school during the semester, errands, learning a synthesizer or effect plugin or something, checking social media, etc. Nights are all about creation - composition, sound design, and all that good stuff that.
Obviously these routines can change, and different things can go in different places for different reasons or bleed over into different times, but it forms muscle memory and good habits, and I feel like after some time your brain gets used to the tasks it's performing so it's more ready TO do the tasks it's performing.