having an ADD day

Not in the troublesome-anxiety-ridden way, but in the on-a-high-for-no-one-real-good-reason-but-won’t-ruin-it-by-over-analysing way. Trouble is, I’m getting paid to work, and today, since I actually have work, and relatively interesting stuff at that, I really should be working instead of allowing myself to get distracted. But I wonder, shouldn’t my wasting time be justified since assumingly managers take into account that their workers will have some less efficient days? (Although, I suppose it’s a problem if everyday is a “less efficient day” for one reason or another...)