I know others have commented already, but I'll give you my personal $.02.

My ability to concentrate during the day often relates to my ability to relax the night before. Before I go to bed, I usually unplug a bit. Read a book. No, not an OR book, but usually something in some other form of interest I have. (Theology, Philosophy, Math, Russian, Etc.) This way, I'm still thinking, and not completly brain-dead by the end of the evening.

Getting enough sleep helps too.

My cube-farm-area is just too quiet. Music ranging from Celtic, to Techno, to Phish, to Rammstein helps. I usually multitask a couple windows between e-mail/pm/and such.

Granted it doesnt always work. I also have found that a big lunch, leads to a tired body at 2pm.... So I try to in health, instead of in quantity.

Well, I hope this helps, and if not at least you.. um.. its almost time for my nap. :)

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