On which days of the week do workers have the most energy?

Fast Company recently published an internal email from one of Google's workers who shared with his colleagues a few tips on time management, laced with terms like "implementation intention." The entire letter can be found here, but the main takeaways were the following:

• If you don't set aside a specific time and method for doing something, it probably won't get done.
• A worker's energy is like a wave throughout the week, with energy levels at their highest on Tuesdays and Wednesdays, and lowest on Mondays and Fridays. Plan accordingly.
• Shift your "Make Time" toward the mornings, before afternoon "decision fatigue" sets in.