Writer JD Arbuckle has a longish piece about studying your habits and rhythms in order to improve your productvity. It’s interesting but this is the bit that grabs me:
Move into a completely different task between 2PM – 3PM. Most people suffer from a mid-afternoon crash during this time. The worst thing you can do during this hour is try to grind through the crash. Instead, head to a local restaurant and meet a friend. Switch into workout clothes and run the lake. Go run errands and pick up groceries. After this break, you will return to finish the rest of your work completely re-energized and focused (If you haven’t already finished everything between 9-2)
Read the full piece.