While I love naps - I can't take them if I intend to stay productive. On the weekend with nothing to do (or nothing I want to be doing) - I can doze off, and it's great.
But I'm ALWAYS super groggy afterwards - and often, my naps will turn into early bedtime.
Then I wake up at 2am, and fidget around, you know - to completely disrupt my circadian cycle.
-sigh-