I took a nap in the middle of my awake period because I was so tired. I woke up and didn't feel better.
BUT - I am hardcore so I continue.
I take my regularly scheduled nap and wake up after only 14 minutes, feeling great. I love it!
I overslept by 3.5 hours. I didn't even hear my stupid alarm clock. Now I'm pissed.
I'm going to set up a whole stereo in there and aim it at my face.
I'm also going to use a dedicated computer, rather than my laptop, so that nothing will interfere with it.
I set Nap as a required daily activity a bit back.
It's been marvelously amazing.
The first few hours after waking, in general, are just so much better for willpower and creativity.
A decent nap -- sometimes even just 20 minutes will do, sometimes longer -- seems to give 90% of the benefits of "just woke up for the first time.
It's really marvelous. Try it. I'm mandating it for myself under normal circumstances, rearranging my schedule to nap, etc. It's that good.