I too am a busy bee. I constantly feel the need to be doing work and making myself feel productive, otherwise I see every moment that I don't as a waste. But you're right, it's okay to take a break.
Last summer, I spent an entire week just napping on the ocean shores and I can honestly say it was the most relaxing vacation I ever had (and I didn't consider it to be a waste of time).
Thanks for the post!