If you're able, use a portion of your lunch hour for a nap, even as little as 10 minutes. Create a dark space by closing office shades and shutting the door. Use a neck rest like those made for airplane flights so your neck is protected while you lean back in your chair. Or check out the Dream Helmet, a pillow and eye mask device in one that straps around your head for napping. If you worry about falling into a deep sleep or nodding off for too long, set the alarm on your cell phone to wake you after just 10 to 20 minutes max.
And, finally, to build awareness and support in your workplace, carefully share the link to this segment (and a recent BusinessWeek article on the popularity of napping on the job) with colleagues and bosses to tout this unique opportunity to improve productivity. If it's good for Google, then it may get the boss's attention.