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I sometimes will nap in a conference room for twenty minutes just testing my head on my arms which I have crossed on the table. Helps tremendously.

Are you eating large heavy meals? Try more, smaller, lighter meals.

Good point, this is probably a contributing factor that I've overlooked.

I have the same problem.

Usually I make sure I have some busywork or easy stuff set aside that I can do in that time period without requiring a lot of mental effort.

I often just go for walks at this point in the afternoon.