Manage your energy, not your time.
WHY? Once you deplete your energy, you lose any ability you had to control your time, and thus are unable to re-energize.
HOW? Establish “ritual behaviors” advises Tony Schwartz, co-author of “The Power of Full Engagement.” These could be a hard-and-fast bedtime, a set time to exercise in the morning or intermittent breaks throughout the day.
SOURCE: Harvard Business Review, October 2007