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15 to 20-minute nap after drinking coffee makes you feel more alert

Luke Shaffer shows his signature leaf design on the top of a latte in his 21st Street coffee and tea shop in Pittsburgh's Strip District on May 21, 2008 (AP Photo/Keith Srakocic)
Sscientist say having coffee and then a 15 to 20-minute nap is the best combination to make you feel alert.

It takes 15 to 20-minutes for the caffeine in coffee to work in the brain, according to researchers at the University of britain.

Researchers say the caffeine and sleep interact with a molecule in the brain which makes us feel drowsy.

They found that a nap that ends as the caffeine clears the brain of the molecule has most people raring to go.
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