Napping or meditating?

I have a friend who claims she never takes a nap in the daytime.  She does admit though to meditating for up to 20 minutes at a time.  I've tried this but I must not be doing it right because my meditations always seem to turn into naps. Perhaps I shouldn't be sprawled on the couch when I meditate but I like to be comfortable.  Napping is a time honored tradition in my family.  When I was a child (even into my teens) my mother always had us take a nap after lunch when we were at home, during summer vacations.  Actually, she had us each go to our own room for a half hour of quiet time.  We could read or whatever.  The idea being that if my brother and I were quiet for a while, our much younger brother would take a nap. I treasured these times away from pesky brothers and able to read to my heart's content.  It wasn't until many years later, when I was a mother with young children of my own, that I realized that my mother had something beyond our health and wellfare in mind when she insisted on naps.  I'm pretty sure she spent that time 'meditating.'