We all know that we need regular doses of love, exercise, and healthy meals to keep our hearts and minds in good shape. But new research suggests that most of us overlook another critical habit -- the daily catnap.

Imagine if American businessmen and women traded their late afternoon conference calls and post lunch meetings for a quick siesta. The country would become suddenly quiet as corporate executives climbed on or under their desks for 20 minutes of shut-eye.

The Spaniards have no problem living such a life. The siesta is an established part of Spanish culture, and though workaholic Americans will most likely never stop their business day for a mid afternoon nap, recent medical research has found that taking such a break after lunch makes more sense than ever.

There is no denying the four p.m. slump. Without warning, it sneaks up on unsuspecting workers, zapping productivity and prompting emergency caffeine runs. A ten-minute catnap could