Hi Rubns,
Don't know if you're still interested, since your post is from April, but the common wisdom I have read is that you usually only get a 4-6 hour energy boost from the nap. So you don't want the end of the nap to be too far before the beginning of the core or you'll get tired prematurely. Of course, there is also the consideration of how far your nap is from the end of your core, and both need to be balanced out.
The reason most people here seem to nap in the evenings is because that's when a lot of people get home from work/school, myself included.
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