Research : 40 million Americans suffer yearly from chronic sleep disorders . Comment: Expert : 15 to 30 minutes of napping can improve performance that day . `` They are called the energy pod and the alpha pod . Still , short nap not going to make up for a long-term sleep deficit , expert says .
Research : 40 million Americans suffer yearly from chronic sleep disorders . Comment: Expert : 15 to 30 minutes of napping can improve performance that day . Still , short nap not going to make up for a long-term sleep deficit , expert says .