The Claim: For a More Restful Nap, Avoid Caffeine

In the UK this advice is actually in the Highway Code (an official government document): http://www.direct.gov.uk/en/TravelAndTransport/Highwaycode/D... (Rule 91)

It's also reasonably well advertised on TV, radio and at service stations.

Since I kicked caffeine (about 3 years ago), my resting heart rate has gone down, my hands are rock steady, I sleep better, and I know longer get crippling headaches when I forget my caffeine fix.

How much caffeine did the people mentioned in this study regularly consume? When I was addicted to caffeine, the stimulant effects were no longer helpful, because I was resistent to it.

Anecdotal evidence, but I find that after a while, caffeine makes me more tired overall, which in turn requires more caffeine to wake me up. I suspect that after a long period of caffeine consumption, the "down" lasts much longer than the "up".

Huh? The article content doesn't match the article title. As I understood it, for a restful nap, you should ingest caffeine and then nap. The caffeine kicks in after 20 minutes, and the short nap clears the sleepiness.