Hey D,That's a Real Good Topic!You know,That makes Alot of Sense!The only catch is, the design of our eyes,As opposed to The animal predators.I for one,Would be spending the time of day,Focusing on Survival by Priority,But I would Alway's be thinking of it as, Security!Secure my person,secure my survival!Come Night time,I hopefully will have secured my camp enough,to get some sleep!If I were in a Survival situation in say...Africa,Then The Napping Idea,would Definitely have to be implemented,No Question about it!