For me it was quite the opposite. I don't feel the urge to nap any longer. Before I often had to stop by the roadside to take a nap on my 1 hour commute on my way home from work. That doesn't happen anymore. In general I am much more alert and bright minded now than I was before I begun with the primal way of living. I've been primal for over 10 months now. I am also 41 years of age.