Question OTD... Should I feel guilty for wanting a nap even though I haven't done anything all day?

I woke up late (around 10am) and have been blogging on this site and the sister site since then.  It's now almost 3pm and I want to nap but I feel guilty like I should be doing other things that are more productive than having a nap.

My justification of napping is that I am going out tonight, but I still feel guilty, even though it is my day off and I rarely ever just "do nothing"...