Sleep for the Wicked

I slept in until noon today and didn't actually get out of bed until 2 p.m. Now, I'm on vacation and I didn't have anywhere to be, but this sleeping in business always makes me feel vaguely guilty, like I should have been up and about, getting my life accomplished or something. It's not like I'm not spending the requisite number of hours awake; I am. I'm just spending most of them in the p.m. and the very early a.m., as opposed to the later a.m. and earlier p.m. Why don't people who go to bed early have guilt? I blame it on Benjamin Franklin ("Early to bed, early to rise...").