The time you do not protect tends to disappear, swallowed by whatever is loudest. If rest and the things that refill you live only in the leftover minutes, they will keep getting crowded out. So put them on the calendar on purpose, and treat them with the same seriousness you give a class meeting.

Block time for focused work so it does not bleed into your evenings. Block time for rest, a walk, a lunch away from your desk, an evening that is truly off, and let it be as real as any appointment. You are not stealing this time from your work. You are making sure there is a you left to do the work, and a life worth doing it for.