I'm struggling with that, too
I second Matt's suggestion of setting an alarm clock for 20 min.
When I feel an afternoon need to rest I either lie on the floor with my feet up visualizing a nice, natural place like a beach, or I listen to an hypnosis CD or something to make that time more productive.
I've also read a 10 minute brisk walk can make us feel more alert, but I can't say I tried that option.
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